How to enter powers - Getting Started - Numbas at mathcentre.ac.uk

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steve kilgallon

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steve kilgallon 8 years, 6 months ago

Created this as a copy of How to enter powers - Getting Started.

Name	Status	Author	Last Modified
How to enter powers - Getting Started	Ready to use	Newcastle University Mathematics and Statistics	20/11/2019 14:50
How to enter powers - Getting Started	draft	steve kilgallon	19/09/2016 22:07
Bedienung von Numbas: Potenzen eingeben	Ready to use	Ulrich Görtz	13/09/2024 19:25

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Question statement

In this example we show you how to input powers. It is important that you get this right as many questions ask for such inputs.

The standard way of inputting powers is as follows:

$a^b$ is input as a^b - and this is the only way to input powers.

But you have to be careful with inputting expressions such as $e^{2x}$ and $(xy)^2$ . In these cases brackets should be used, as we now show:

Power	Correct Input	Incorrect Input
$e^{2x}$	`e^(2*x)`	`e^2*x` (system thinks this is $e^2 \times x$ )
$(xy)^2$	`(x*y)^2`	`x*y^2` (system thinks this is $x \times y^2$ )

So make sure that you use brackets to properly define your powers. This is a major source of input inaccuracies.

Give any introductory information the student needs.

			Name	Type	Generated Value

a	integer	8
c	integer	-9
b	integer	7
d	integer	-6
f	integer	-1
s	integer	1

Automatically regenerate variables?

Name

Data type

Value

xxxxxxxxxx
 
random(6..12)*s

JME function reference

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: `integer`

← Depends on:

→ Used by:

"Part a)" - prompt
"Part a)" → "Unnamed gap" - Correct answer

Parts

Part a) Gap-fill
1. Gap Mathematical expression
  Add
Part b) Gap-fill
1. Gap Mathematical expression
  Add
Part c) Gap-fill
1. Gap Mathematical expression
  Add

Gap-fill

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

To test your input of powers try the following examples:

Input as a single power of $x$ :

$\simplify[all]{e^({a}*x)e^({b}*x)}=\;$ Unnamed gap

(The answer is $\simplify[all]{e^({a+b}x)}$ but you have to enter it properly.)

Your input is shown in mathematical notation in a box next to your input so that you can check that you have entered it correctly.

Click on Submit part to check on your answer.

Click on the input field and edit your answer by inputting without brackets around the powers to see what happens.

Advice

Give a worked solution to the whole question.

Use this tab to check that this question works as expected.

There was an error which means the tests can't run:

Part	Test	Passed?
Gap-fill
Gap-fill		Hasn't run yet
Mathematical expression
Mathematical expression		Hasn't run yet
Gap-fill
Gap-fill		Hasn't run yet
Mathematical expression
Mathematical expression		Hasn't run yet
Gap-fill
Gap-fill		Hasn't run yet
Mathematical expression
Mathematical expression		Hasn't run yet

This question is not used in any exams.

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How to enter powers - Getting Started

Metadata

Taxonomy: mathcentre

Taxonomy: Kind of activity

Taxonomy: Context

Contributors

History

Comment

Checkpoint description

steve kilgallon 8 years, 6 months ago

Error in variable testing condition

Error

Warning

Generated value: `integer`

Parts

Gap-fill

Loading...

Error

How to enter powers - Getting Started

Metadata

Taxonomy: mathcentre

Taxonomy: Kind of activity

Taxonomy: Context

Contributors

History

Comment

Checkpoint description

steve kilgallon 8 years, 6 months ago

Error in variable testing condition

Error

Warning

Generated value: integer

Parts

Gap-fill

Generated value: `integer`