Moderate -0.5 This is a standard completing the square exercise with straightforward coefficients. It requires a routine algebraic technique taught early in C1 with no problem-solving insight needed, making it slightly easier than average but not trivial since students must execute multiple steps correctly.
Question 5:
5 | 5(x + 2)2 − 14 | 4 | B1 for a = 5, and B1 for b = 2
and B2 for c = −14 or M1 for c = 6 −
their ab2 or
M1 for [their a](6/their a − their b2)
[no ft for a = 1]