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Christian Lawson-Perfect 2 years, 7 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, 7 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, 7 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, 7 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.
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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.
- 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.
- MATH1601 CA1 Semester 1 by Blathnaid Sheridan in Blathnaid's workspace.
- PH022 Week 4 Quadratics Quiz by Vicky Mason in Vicky's workspace.
- QuadraticEquationAndExpression by AJAY OTTA in AJAY's workspace.
- Algebra by Alan Levine in Mathtest Questions.