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HELM Book 1.3

1.3.4. Task: Factorise 3

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Name

Description

Factorise an expression of 2 or 3 terms where the gcd is a letter times a number. Part of HELM Book 1.3.4

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Metadata

Author

Merryn Horrocks

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1.3.4. Task: Factorise 2 by Merryn Horrocks

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HELM books

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Licence information

Ability levels

England schools
- Primary school
- Key Stage 1
- Key Stage 2
- Key Stage 3
- Key Stage 4 / GCSE
- A-Level
England university
- Transition to university
- Stage 1
- Stage 2
- Stage 3
- Postgraduate
Scotland schools
- 1st Level
- 2nd Level
- 3rd/4th Level
- National 4 & 5
- Higher
- Advanced Higher

Taxonomy: mathcentre

mathcentre's taxonomy.

1 - Numbers and Computation

1.1 - Number Concepts

1.1.1 - Natural

1.1.2 - Integers

1.1.3 - Rational

1.1.4 - Irrational

1.1.5 - Algebraic

1.1.6 - Real

1.1.7 - Complex

1.1.8 - Famous Numbers

1.1.8.1 - 0

1.1.8.2 - pi

1.1.8.3 - e

1.1.8.4 - i

1.1.8.5 - Golden Mean

1.1.9 - Symbols, constants

1.2 - Arithmetic

1.2.1 - Operations

1.2.1.1 - Addition

1.2.1.2 - Subtraction

1.2.1.3 - Multiplication

1.2.1.4 - Division

1.2.1.5 - Roots

1.2.1.6 - Factorials

1.2.1.7 - Factoring

1.2.1.8 - Properties of Operations

1.2.1.9 - Estimation

1.2.2 - Fractions

1.2.2.1 - Addition

1.2.2.2 - Subtraction

1.2.2.3 - Multiplication

1.2.2.4 - Division

1.2.2.5 - Ratio and Proportion

1.2.2.6 - Equivalent Fractions

1.2.3 - Decimals

1.2.3.1 - Addition

1.2.3.2 - Subtraction

1.2.3.3 - Multiplication

1.2.3.4 - Division

1.2.3.5 - Percents

1.2.4 - Comparison of numbers

1.2.5 - Exponents

1.2.5.1 - Multiplication

1.2.5.2 - Division

1.2.5.3 - Powers

1.2.5.4 - Integer Exponents

1.2.5.5 - Rational Exponents

1.2.6 - Logarithms

1.2.6.1 - Addition

1.2.6.2 - Subtraction

1.2.6.3 - Multiplication

1.2.6.4 - Natural logarithms

1.2.6.5 - Change of base

1.3 - Patterns and Sequences

1.3.1 - Number Patterns

1.3.2 - Fibonacci Sequence

1.3.3 - Arithmetic Sequence

1.3.4 - Geometric Sequence

1.4 - Measurement

1.4.1 - Units of Measurement

1.4.1.1 - Metric System

1.4.1.2 - Standard Units

1.4.1.3 - Nonstandard Units

1.4.2 - Linear Measure

1.4.2.1 - Distance

1.4.2.2 - Circumference

1.4.2.3 - Perimeter

1.4.3 - Area

1.4.3.1 - Area of Polygons

1.4.3.2 - Area of Circles

1.4.3.3 - Surface Area

1.4.3.4 - Nonstandard Shapes

1.4.4 - Volume

1.4.5 - Weight and Mass

1.4.6 - Temperature

1.4.7 - Time

1.4.8 - Speed

1.4.9 - Money

1.4.10 - Scale

2 - Logic and Foundations

2.1 - Logic

2.1.1 - Logic

2.1.2 - Propositional and Predicate Logic

2.1.3 - Methods of Proof

2.2 - Set Theory

2.2.1 - Sets and Set Operations

2.2.2 - Relations and Functions

2.2.3 - Cardinality

2.2.4 - Axiom of Choice

2.3 - Computability and Decidability

2.4 - Model Theory

3 - Algebra and Number Theory

3.1 - Algebra

3.1.1 - Graphing Techniques

3.1.2 - Algebraic Manipulation

3.1.2.1 - Collecting like terms

3.1.2.2 - Rules of indices for single term expressions

3.1.2.2.1 - Surds

3.1.2.3 - Polynomial expressions

3.1.2.3.1 - Multiplying out brackets

3.1.2.3.1.1 - Multiplying a single-term expression and bracket

3.1.2.3.1.2 - Multiplying two brackets

3.1.2.3.1.3 - Pure powers

3.1.2.3.1.4 - The difference of two squares

3.1.2.3.1.5 - Multiple brackets

3.1.2.3.2 - Factoring polynomials

3.1.2.3.2.1 - Single term common factor

3.1.2.3.2.2 - Quadratic expressions

3.1.2.3.2.3 - Higher powers

3.1.2.3.2.4 - Multiple variable expressions

3.1.2.4 - Algebraic fractions

3.1.2.4.1 - Cancelling

3.1.2.4.1.1 - Cancelling fractions involving factorising

3.1.2.4.2 - Multiplying by -1

3.1.2.4.3 - Adding and subtracting algebraic fractions

3.1.2.4.4 - Multiplying and dividing algebraic fractions

3.1.2.4.5 - Partial fractions

3.1.2.4.6 - Rationalizing surd expressions

3.1.2.5 - Completing the square of a quadratic expression

3.1.2.6 - Rearranging equations

3.1.2.6.1 - Substituting from one formula into another

3.1.2.6.2 - Making a specified letter the subject of a formula

3.1.2.6.3 - Substitution

3.1.2.7 - De-nesting surds

3.1.3 - Functions

3.1.3.1 - Linear

3.1.3.2 - Quadratic

3.1.3.3 - Polynomial

3.1.3.4 - Rational

3.1.3.5 - Exponential

3.1.3.6 - Logarithmic

3.1.3.7 - Piece-wise

3.1.3.8 - Step

3.1.3.9 - Hyperbolics

3.1.3.9.1 - Hyperbolic functions

3.1.3.9.2 - Inverse hyperbolic functions

3.1.3.9.3 - Hyperbolic identities

3.1.4 - Equations

3.1.4.1 - Linear

3.1.4.2 - Quadratic

3.1.4.3 - Polynomial

3.1.4.4 - Rational

3.1.4.5 - Exponential

3.1.4.6 - Logarithmic

3.1.4.7 - Systems

3.1.5 - Inequalities

3.1.6 - Matrices

3.1.7 - Sequences and Series

3.1.8 - Algebraic Proof

3.2 - Linear Algebra

3.2.1 - Systems of Linear Equations

3.2.2 - Matrix algebra

3.2.3 - Vectors in R3

3.2.4 - Vector Spaces

3.2.5 - Linear Transformations

3.2.6 - Eigenvalues and Eigenvectors

3.2.7 - Inner Product Spaces

3.3 - Abstract Algebra

3.3.1 - Groups

3.3.2 - Rings and Ideals

3.3.3 - Fields

3.3.4 - Galois Theory

3.3.5 - Multilinear Algebra

3.4 - Number Theory

3.4.1 - Integers

3.4.2 - Primes

3.4.2.1 - Divisibility

3.4.2.2 - Factorization

3.4.2.3 - Distributions of Primes

3.4.3 - Congruences

3.4.4 - Diophantine Equations

3.4.5 - Irrational Numbers

3.4.6 - Famous Problems

3.4.7 - Coding Theory

3.4.8 - Cryptography

3.5 - Category Theory

3.6 - K-Theory

3.7 - Homological Algebra

3.8 - Modular Arithmetic

4 - Discrete Mathematics

4.1 - Cellular Automata

4.2 - Combinatorics

4.2.1 - Combinations

4.2.2 - Permutations

4.3 - Game Theory

4.4 - Algorithms

4.5 - Recursion

4.6 - Graph Theory

4.7 - Linear Programming

4.8 - Order and Lattices

4.9 - Theory of Computation

4.10 - Chaos

5 - Geometry and Topology

5.1 - Geometric Proof

5.2 - Plane Geometry

5.2.1 - Measurement

5.2.2 - Lines and Planes

5.2.3 - Angles

5.2.4 - Triangles

5.2.4.1 - Properties

5.2.4.2 - Congruence

5.2.4.3 - Similarity

5.2.4.4 - Pythagorean Theorem

5.2.5 - Polygons

5.2.5.1 - Properties

5.2.5.2 - Regular

5.2.5.3 - Irregular

5.2.5.4 - Congruence

5.2.5.5 - Similarity

5.2.6 - Circles

5.2.7 - Patterns

5.2.7.1 - Geometric Patterns

5.2.7.2 - Tilings and Tessellations

5.2.7.3 - Symmetry

5.2.7.4 - Golden Ratio

5.2.8 - Transformations

5.2.8.1 - Translation

5.2.8.2 - Rotation

5.2.8.3 - Reflection

5.2.8.4 - Scaling

5.3 - Solid Geometry

5.3.1 - Dihedral Angles

5.3.2 - Spheres

5.3.3 - Cones

5.3.4 - Cylinders

5.3.5 - Pyramids

5.3.6 - Prisms

5.3.7 - Polyhedra

5.4 - Analytic Geometry

5.4.1 - Cartesian Coordinates

5.4.2 - Lines

5.4.3 - Circles

5.4.4 - Planes

5.4.5 - Conics

5.4.6 - Polar Coordinates

5.4.7 - Parametric Curves

5.4.8 - Surfaces

5.4.9 - Distance Formula

5.5 - Projective Geometry

5.6 - Differential Geometry

5.7 - Algebraic Geometry

5.8 - Topology

5.8.1 - Point Set Topology

5.8.2 - General Topology

5.8.3 - Differential Topology

5.8.4 - Algebraic Topology

5.9 - Trigonometry

5.9.1 - Angles

5.9.2 - Trigonometric Functions

5.9.3 - Inverse Trigonometric Functions

5.9.4 - Trigonometric Identities

5.9.5 - Trigonometric Equations

5.9.6 - Roots of Unity

5.9.7 - Spherical Trigonometry

5.10 - Fractal Geometry

6 - Calculus

6.1 - Single Variable

6.1.1 - Functions

6.1.2 - Limits

6.1.3 - Continuity

6.1.4 - Differentiation

6.1.5 - Integration

6.1.6 - Series

6.2 - Several Variables

6.2.1 - Functions of Several Variables

6.2.2 - Limits

6.2.3 - Continuity

6.2.4 - Partial Derivatives

6.2.5 - Multiple integrals

6.2.6 - Taylor Series

6.3 - Advanced Calculus

6.3.1 - Vector Valued Functions

6.3.2 - Line Integrals

6.3.3 - Surface Integrals

6.3.4 - Stokes Theorem

6.3.5 - Curvilinear Coordinates

6.3.6 - Linear spaces

6.3.7 - Fourier Series

6.3.8 - Orthogonal Functions

6.4 - Tensor Calculus

6.5 - Calculus of Variations

6.6 - Operational Calculus

7 - Analysis

7.1 - Real Analysis

7.1.1 - Metric Spaces

7.1.2 - Convergence

7.1.3 - Continuity

7.1.4 - Differentiation

7.1.5 - Integration

7.1.6 - Measure Theory

7.2 - Complex Analysis

7.2.1 - Convergence

7.2.2 - Infinite Series

7.2.3 - Analytic Functions

7.2.4 - Integration

7.2.5 - Contour Integrals

7.2.6 - Conformal Mappings

7.2.7 - Several Complex Variables

7.3 - Numerical Analysis

7.3.1 - Computer Arithmetic

7.3.2 - Solutions of Equations

7.3.3 - Solutions of Systems

7.3.4 - Interpolation

7.3.5 - Numerical Differentiation

7.3.6 - Numerical Integration

7.3.7 - Numerical Solutions of ODEs

7.3.8 - Numerical Solutions of PDEs

7.4 - Integral Transformations

7.4.1 - Fourier Transforms

7.4.2 - Laplace Transforms

7.4.3 - Hankel Transforms

7.4.4 - Wavelets

7.4.5 - Other Transforms

7.5 - Signal Analysis

7.5.1 - Sampling Theory

7.5.2 - Filters

7.5.3 - Noise

7.5.4 - Data Compression

7.5.5 - Image Processing

7.6 - Functional Analysis

7.6.1 - Hilbert Spaces

7.6.2 - Banach Spaces

7.6.3 - Topological Spaces

7.6.4 - Locally Convex Spaces

7.6.5 - Bounded Operators

7.6.6 - Spectral Theorem

7.6.7 - Unbounded Operators

7.7 - Harmonic Analysis

7.8 - Global Analysis

8 - Differential and Difference Equations

8.1 - Ordinary Differential Equations

8.1.1 - First Order

8.1.2 - Second Order

8.1.3 - Linear Oscillations

8.1.4 - Nonlinear Oscillations

8.1.5 - Systems of Differential Equations

8.1.6 - Sturm Liouville Problems

8.1.7 - Special Functions

8.1.8 - Power Series Methods

8.1.9 - Laplace Transforms

8.2 - Partial Differential Equations

8.2.1 - First Order

8.2.2 - Elliptic

8.2.3 - Parabolic

8.2.4 - Hyperbolic

8.2.5 - Integral Transforms

8.2.6 - Integral Equations

8.2.7 - Potential Theory

8.2.8 - Nonlinear Equations

8.2.9 - Symmetries and Integrability

8.3 - Difference Equations

8.3.1 - First Order

8.3.2 - Second Order

8.3.3 - Linear Systems

8.3.4 - Z Transforms

8.3.5 - Orthogonal Polynomials

8.4 - Dynamical Systems

8.4.1 - 1D Maps

8.4.2 - 2D Maps

8.4.3 - Lyapunov Exponents

8.4.4 - Bifurcations

8.4.5 - Fractals

8.4.6 - Differentiable Dynamics

8.4.7 - Conservative Dynamics

8.4.8 - Chaos

8.4.9 - Complex Dynamical Systems

9 - Statistics and Probability

9.1. - Data Collection

9.1.1. - Experimental Design

9.1.2. - Sampling and Surveys

9.1.3. - Data and Measurement Issues

9.2. - Data Summary and Presentation

9.2.1. - Summary Statistics

9.2.1.1. - Measures of Central Tendency

9.2.1.2. - Measures of Spread

9.2.2. - Data Representation

9.2.2.1. - Graphs and Plots

9.2.2.2. - Tables

9.3. - Statistical Inference and Techniques

9.3.1. - Sampling Distributions

9.3.2. - Regression and Correlation

9.3.3. - Confidence Intervals

9.3.4. - Hypothesis Tests

9.3.5. - Statistical Quality Control

9.3.6. - Non-parametric Techniques

9.3.7. - Multivariate Techniques

9.3.8. - Survival Analysis

9.3.9. - Bayesian Statistics

9.4. - Probability

9.4.3 - Limit Theorems

9.4.3.1 - Central Limit Theorem

9.4.3.2 - Law of Large Numbers

9.4.5 - Stochastic Processes

9.4.5.1 - Brownian Motion

9.4.5.2 - Markov Chains

9.4.5.3 - Queuing Theory

9.4.6 - Probability Measures

9.4.7 - Simulation

9.4.1. - Elementary Probability

9.4.1.1. - Sample Space and Events

9.4.1.2. - General Rules

9.4.1.3. - Combinations and Permutations

9.4.1.4. - Random Variables

9.4.2. - Univariate Distributions

9.4.2.1. - Discrete Distributions

9.4.2.2. - Continuous Distributions

9.4.2.3. - Expected Value

9.4.4. - Multivariate Distributions

9.4.4.1 - Joint

9.4.4.2 - Conditional

9.4.4.3 - Expectations

10.0 - Applied Mathematics

10.1 - Mathematical Physics

10.2 - Mathematical Economics

10.3 - Mathematical Biology

10.4 - Mathematics for Business

10.5 - Engineering Mathematics

10.5.1 - Mathematics for Materials

10.6 - Mathematical Sociology

10.7 - Mathematics for Social Sciences

10.7.1 - Mathematics for Social Policy and Social Work

10.8 - Mathematics for Computer Science

10.9 - Mathematics for Humanities

10.9.1 - Mathematics for Art, Design and Communication

10.9.2 - Mathematics for Built Environment

10.9.3 - Mathematics for History, Classics and Archaeology

10.9.4 - Mathematics for Law

10.9.5 - Mathematics for Performing Arts

10.9.6 - Mathematics for Education

10.9.7 - Mathematics for Languages, Linguistics and Area Studies

10.9.7.1 - Mathematics for English

10.9.8 - Mathematics for Philosophical and Religious Studies

10.10 - Consumer Mathematics

10.11 - Mathematics for Economics

10.12 - Mathematics for Life Sciences

10.12.1 - Mathematics for Geography, Earth and Environmental Sciences

10.12.2 - Mathematics for Bioscience

10.12.3 - Mathematics for Health Sciences and Practice

10.12.4 - Mathematics for Medicine, Dentistry and Veterinary Medicine

10.13 - Mathematics for Psychology

10.14 - Mathematics for Physical Sciences

10.15 - Mathematics for Sociology, Anthropology and Politics

10.16 - Mathematics for Hospitality, Leisure, Sport and Tourism

11.0 - Mathematics History

11.1 - General

11.2 - Famous Problems

11.3 - Biographies of Mathematicians

12.0 - Mathematical Education

Taxonomy: Kind of activity

1 - Create

1.1 - Give an example

1.2 - Give a starting point

1.3 - Give an argument

2 - Evaluate

2.1 - Make a decision

2.2 - Classify an object

3 - Analyze

3.1 - Interpret a situation

3.2 - Select from a list of options

3.3 - Identify an error

4 - Apply

4.1 - Use formulas

4.2 - Perform a routine calculation or algorithm

4.3 - Apply an algorithm

5 - Understand

5.1 - Use an appropriate formula

5.2 - Identify a component

6 - Remember

6.1 - Recall a fact

Taxonomy: Context

1 - Mathematics

1.1 - Pure

1.2 - Applied

1.3 - For...

1.3.1 - Accountancy

1.3.2 - Business

1.3.3 - Psychology

1.3.4 - Science

1.3.4.1 - Biomedicine

1.3.4.2 - Chemistry

1.3.4.3 - Biology

2 - Statistics

2.1 - Bayesian

2.2 - Frequentist

3 - Physics

3.1 - Theoretical

4 - Engineering

4.1 - Civil

4.2 - Electrical

4.3 - Chemical

5 - Chemistry

Contributors

Merryn Horrocks

Feedback

From users who are members of HELM books :

Merryn Horrocks

said

Ready to use

1 year, 7 months ago

History

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Checkpoint description

Describe what's changed since the last checkpoint.

○

Merryn Horrocks 1 year, 7 months ago

Gave some feedback: Ready to use

○

Merryn Horrocks 1 year, 7 months ago

Published this.

○

Merryn Horrocks 1 year, 8 months ago

Created this as a copy of 1.3.4. Task: Factorise 2.

Name	Status	Author	Last Modified
1.3.4. Task: Factorise 1	Ready to use	Merryn Horrocks	07/09/2023 05:48
1.3.4. Task: Factorise 2	Ready to use	Merryn Horrocks	07/09/2023 06:19
1.3.4. Task: Factorise 3	Ready to use	Merryn Horrocks	15/09/2023 07:00
AB6 - Factorise by taking out a factor	Ready to use	Andrew Neate	09/04/2024 15:05

There are 4 other versions that do you not have access to.

Question statement

Factorise $\var{q2expr}$

Give any introductory information the student needs.

			Name	Type	Generated Value

q2c	list	[ 5, -6, 5 ]
q2v	list	[ "w", "x" ]
q2coeffs	list	[ 25, -30 ]
q2terms	list	[ "25w", "-30w*x" ]
q2expr	expression	25w - 30w*x
q2gcd	number	5
q2ans	expression	5w*(5 - 6x)

			Name	Type	Generated Value

alphabet

list

List of 21 items

Error in variable testing condition

There's an error in the variable testing condition. Variable values can't be generated until it's fixed.

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No variables have been defined in this question.

Name

Data type

Value

xxxxxxxxxx
 
[random(-9..9 except 0), random(-9..9 except 0), random(2..9)]

JME function reference

This variable was automatically created because there's a reference to it somewhere in this question.

Error

Warning

This variable is an interactive HTML node. Interactive HTML nodes can not be relied upon to work correctly when resuming a session - for example, attached event callbacks will be lost, and mathematical notation will likely also break.

If this causes problems, try to create HTML nodes where you use them in content areas, instead of storing them in variables.

Description

Describe what this variable represents, and list any assumptions made about its value.

Can an exam override the value of this variable?

Generated value: `list`

[ 5, -6, 5 ]

← Depends on:

→ Used by:

q2ans
q2coeffs
q2gcd

This variable doesn't seem to be used anywhere.

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Mathematical expression
1. Step Mathematical expression

Mathematical expression

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Ask the student a question, and give any hints about how they should answer this part.

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Correct answer

$\class{jme-subvar}{\left\{q_{2} a n s\right\}}$

The correct answer is an equation. Use the accuracy tab to generate variable values satisfying this equation so it can be marked accurately.

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Give expressions which produce values for each of the variables in the expected answer. Leave blank to pick a random value from the range defined above, following the inferred type of the variable.

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Pattern student's answer must match

​x
 
// a number and a letter times...
`+-$n`? * $v *
(
  //   either a number 'a' times x,
  //   or x on its own, and 'a' is implicitly 1
  `+-($n;a * $v`? `| $v;a:1) 
  
  + `+-
  
  //   either a number 'b' times x,
  //   or x on its own, and 'b' is implicitly 1
  ($n;b * $v`? `| $v;b:1)
)
​
// a and b must be coprime
`where
​
(gcd(a,b)=1)

${\operatorname{\color{grey}{\pm}}\text{number}}^{\operatorname{\color{grey}{?}}} \text{name} \times \left ( \operatorname{\color{grey}{\pm}}\left ( \underset{\color{grey}{a}}{\text{number}} {\text{name}}^{\operatorname{\color{grey}{?}}} \operatorname{\color{grey}{|}} \underset{\color{grey}{\textrm{a} \operatorname{\colon} 1}}{\text{name}} \right ) + \operatorname{\color{grey}{\pm}}\left ( \underset{\color{grey}{b}}{\text{number}} {\text{name}}^{\operatorname{\color{grey}{?}}} \operatorname{\color{grey}{|}} \underset{\color{grey}{\textrm{b} \operatorname{\colon} 1}}{\text{name}} \right ) \right ) \operatorname{\color{grey}{where}} \operatorname{gcd} \left ( a, b \right ) = 1$

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You have not fully factorised the expression.

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Advice

The two terms share a common factor of $\var{q2gcd}\var{latex(q2v[0])}$ which can be factored out.

So $\var{q2expr} = \var{q2ans}$

Give a worked solution to the whole question.

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1.3.4. Task: Factorise 3

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Taxonomy: mathcentre

Taxonomy: Kind of activity

Taxonomy: Context

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Checkpoint description

Merryn Horrocks 1 year, 7 months ago

Merryn Horrocks 1 year, 7 months ago

Merryn Horrocks 1 year, 8 months ago

Error in variable testing condition

Error

Warning

Generated value: list

Parts

Mathematical expression

Advanced settings

Checking accuracy

Variable value generators

Pattern restriction

Variables

String restrictions

Generated value: `list`