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From users who are members of Transition to university :
|Christian Lawson-Perfect||said||Ready to use||3 years, 8 months ago|
|Hannah Aldous||said||Needs to be tested||3 years, 9 months ago|
|Vicky Hall||said||Has some problems||3 years, 9 months ago|
|Lauren Richards||said||Has some problems||3 years, 10 months ago|
Christian Lawson-Perfect 3 years, 8 months ago
Saved a checkpoint:
I've changed the parts so:
- part a always has two negative roots
- part b always has one positive root and one negative
- part c is the difference of two squares.
I don't think there was any point in the version which had a constant on the RHS.
I've added a marking script to check that the student's answer is factorised, rather than using string restrictions.
Christian Lawson-Perfect 3 years, 9 months ago
Saved a checkpoint:
You need to write a feedback message to show when the student doesn't use brackets.
I got $x^2-16$ for part b, which I'd solve by noticing it's the difference of two squares. Can you make sure the coefficient $x$ is non-zero?
I'd spin part b into its own question: first factorise, then write down the roots.
Vicky Hall 3 years, 9 months ago
I think this question should be renamed to 'factorising quadratic equations with $x^2$ coefficient $1$, and your other question (Factoring quadratics with larger coefficients) should be renamed 'factorising quadratic equations with $x^2$ coefficient greater than $1$.
There should be another line in the statement that shows how to solve the equation if it factorises to $(x+m)(x+n)=0$, as you ask the student to solve in the final part of the question.
In part a), I think it's a good idea to have a difference of two squares example to get students to think about how the equation can sometimes look a bit different. However, I think this should be moved to a subpart iii), and subpart i) should have a straightforward quadratic that looks exactly like the general form $ax^2+bx+c$.
Lauren Richards 3 years, 10 months ago
- MAIN PARTS
- There is a "$" sign in the statement.
- MAYBE suggest the form to answer the question in in part a) but then again if they have read the statement, they should know which form to have it in so up to you really.
- I think you should put a full stop after the formula in part b) and then start "input" with a capital letter.
- No comma needed after "obtain" in part a)i).
- Part b is fine!
- Great question!
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