O-LevelAdditional MathematicsQuadratic functions4037/21 · May/June 2024 · Q24 Marks
Write 3+4x-2x² in the form a+b(x+c)², where a, b and c are integers.
- (a)Write 3+4x-2x² in the form a+b(x+c)², where a, b and c are integers.[3]
- (b)Hence write down the range of the function f(x) = 3+4x-2x², where x ∈R.[1]
Mark scheme
Marking points from the official mark scheme (May/June 2024). The mark or mark type is shown in brackets.
- [B3] Mark final expression
- [B2] for –2(x – 1)²
- [B1] for (x – 1)² or b = –2, c = –1
- [B1] for 5 + b(x + c)² oe with numerical values of b and c or a = 5
- [B1] f ≤ their 5
Write your answer and get it marked
On Oracle Prep you can write or photograph your own answer and have it marked by AI against this mark scheme, with feedback on what you missed.
Sign up free →