Moderate -0.8 This is a straightforward two-part question requiring factorization of a simple quadratic (y-3)(y-4)=0, then substitution y=x² to solve the quartic. Both parts are routine C1 techniques with no problem-solving insight needed, making it easier than average but not trivial since it requires recognizing the substitution pattern.
Question 3:
3 | (y − 3)(y − 4) [= 0]
y = 3 or 4 cao
x=± 3 or ±2 cao | M1
A1
B2 | for factors giving two terms correct or
attempt at quadratic formula or
completing square
or B2 (both roots needed)
B1 for 2 roots correct or ft their y
(condone √ 3 and √ 4 for B1) | 4