There was an error loading the page.
History and Feedback
Christian Lawson-Perfect 2 years, 2 months ago
Saved a checkpoint:
The marking is set up wrong: $k(-6)$ is the application of the function $k$, not $-6 \times k$. You can avoid this by writing $(\ldots)k$ instead of $k(\ldots)$.
It's not obvious what order you should enter the roots. The best I can come up with for a hint is "Assuming $k$ is positive, enter the lowest root first." I can't think how to be any clearer without giving a hint about the form of the answer.
You need \left and \right around brackets to make sure they stretch to fit around fractions.
Put the quadratic formula in the advice just before you list the values for $a$, $b$ and $c$.
Chris Graham 2 years, 2 months ago
When the variable C_2 is zero, your advice states $c = 0k^2$, which caused me great confusion (about where the $k^2$ had come from) when I was unlucky enough to generate this on my first attempt. If you would like to keep this scenario, then you will need to adjust the advice, or if it is not desirable then use an
exceptin the generation of B_2 or n2.
Vicky Hall 2 years, 2 months ago
This is a well conceived question but the answers look a bit nasty! It would be a much nicer question if, when we get to the point of having $\sqrt(xk^2)$, the $x$ is a square number. That way we end up with some quantity of $k$ divided by $2$, which may or may not simplify, but it looks a lot better than having a surd or a decimal.
Hannah Aldous 2 years, 2 months agoCreated this as a copy of Using the Quadratic Formula to Solve Equations of the Form $ax^2 +bx+c=0$.
No variables have been defined in this question.
Error in variable testing condition
There's an error in the condition you specified in the Variable testing tab. Variable values can't be generated until it's fixed.
No parts have been defined in this question.
Select a part to edit.
Test that the marking algorithm works
Check that the marking algorithm works with different sets of variables and student answers using the interface below.
Create unit tests to save expected results and to document how the algorithm should work.
There's an error which means the marking algorithm can't run:
Click on a note's name to show or hide it. Only shown notes will be included when you create a unit test.
No unit tests have been defined. Enter an answer above, select one or more notes, and click the "Create a unit test" button.
The following tests check that the question is behaving as desired.
This test has not been run yet This test produces the expected output This test does not produce the expected output
This test is not currently producing the expected result. Fix the marking algorithm to produce the expected results detailed below or, if this test is out of date, update the test to accept the current values.
One or more notes in this test are no longer defined. If these notes are no longer needed, you should delete this test.
|This note produces the expected output||Current:||
This test has not yet been run.
In order to create a variable replacement, you must define at least one variable and one other part.
|Variable||Answer to use||Must be answered?|
The variable replacements you've chosen will cause the following variables to be regenerated each time the student submits an answer to this part:
These variables have some random elements, which means they're not guaranteed to have the same value each time the student submits an answer. You should define new variables to store the random elements, so that they remain the same each time this part is marked.
This question is used in the following exams:
- Summer Project (Optimisation + Methods of proof) by Inbbavathie Ravi in Inbbavathie's workspace.
- summer project 2 ( egyptian fractions+complex numbers) by Inbbavathie Ravi in Inbbavathie's workspace.
- summer project 3 (modular arithmetic + induction) by George Loughlin in George's workspace.
- Quadratic expressions and equations by Christian Lawson-Perfect in Transition to university.
- Nick's copy of Quadratic expressions and equations by Nick Walker in Nick's workspace.
- Quadratic expressions and equations [Randomised L4] by Matthew James Sykes in CHY1205.
- NUMBAS - Quadratics by Katy Dobson in Katy's workspace.
- Ann's copy of NUMBAS - Quadratics by Ann Smith in Ann's workspace.
- Summer Project 2 - practice by Inbbavathie Ravi in Lee's Newcastle Maths & Stats Summer Project 2017.
- Summer Project 3 - practice by Inbbavathie Ravi in Lee's Newcastle Maths & Stats Summer Project 2017.
- Blathnaid's copy of Ann's copy of NUMBAS - Quadratics by Blathnaid Sheridan in Blathnaid's workspace.
- MATH1601 Quiz 3 by Blathnaid Sheridan in Blathnaid's workspace.
- MATH1601 CA1 Semester 1 by Blathnaid Sheridan in Blathnaid's workspace.
- PH022 Week 4 Quadratics Quiz by Vicky Mason in Vicky's workspace.
- Quadratics by Kevin Bohan in Kevin's workspace.
- lksadjf by Jordan Childs in Jordan's workspace.
- Workbook 7 by Jordan Childs in Jordan's workspace.
- Workbook 6 by Jordan Childs in Jordan's workspace.