There was an error loading the page.
History and Feedback
Christian Lawson-Perfect 2 years, 4 months ago
Saved a checkpoint:
I'm not sure why part b had two equations in it. I've split it into two parts.
A couple of uses of "question" instead of "equation" in the advice.
The quadratic formula was missing $x=$ a few times in the advice!
Otherwise, this is good.
Chris Graham 2 years, 4 months ago
I have changed the wording of the statement slightly and also removed "require trailing zeros" in part (a), which was too harsh.
I've removed (i) from part (a) as there is only one sub-part.
Otherwise looks good. However, if this is the first time we meet the quadratic formula (I'm guessing from the way the statement is worded) then I would like to have it available to the student, perhaps as a step to part (a)?
Vicky Hall 2 years, 4 months ago
I would give the quadractic formula in the statement and have $x=$ in front of it. I would amend the statement so that it says it can also be useful to use the formula if equations are difficult to factorise (perhaps if coefficients are large), as the equations in part a) and part b)i) could both be solved by factorising instead but using the formula is (probably) quicker.
The expected answers in part a) are the numbers that would appear in the factorised equation and not the roots so you need to negate the answers and then swap their gaps around.
Christian Lawson-Perfect 2 years, 4 months ago
The non-zero right-hand sides in part a are gotchas: I'd like to have a nice part first, where the right-hand side is zero.
Could you make the coefficients in part b work so that you get integers out? You want to see if the student can work out how to deal with getting an algebraic answer, and rounding errors would be a distraction.
In part b it looks like the roots are the wrong way round - the lowest root is second.
You could split this into two questions: "use the quadratic formula to solve an equation with non-zero RHS", and "use the quadratic formula to solve an equation in terms of another variable".
Lauren Richards 2 years, 4 months ago
- Your i) and ii) need to be not bold and in italics in the parts.
- The quadratic formula equation in the start of the advice is slightly incorrect - it should be 2a on the denominator, not 2.
- Something is not quite right for a)ii) in the advice as it is written as it would be when writing it and also midway through the advice for part b).
No variables have been defined in this question.
This variable doesn't seem to be used anywhere.
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:
- Quadratic expressions and equations by Christian Lawson-Perfect in Transition to university.
- Test1 by Emma Cliffe in Emma's workspace.
- 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.
- Quadratics homework by Ann Smith in Ann's workspace.
- Blathnaid's copy of Ann's copy of NUMBAS - Quadratics by Blathnaid Sheridan in Blathnaid's workspace.
- Initial maths test by J. Richard Snape in J. Richard's workspace.
- JP by Julie Crowley in JP.
- Quadratics by Kevin Bohan in Kevin's workspace.