ECZ 2026 · GCE Paper 1 — Quadratic Functions
The diagram shows a sketch of the graph of y = (-2x + 4)(x + 5), which crosses the x-axis at A and B. Find the maximum value of y.
- A. 24.5
- B. 20
- C. 24
- D. 6.5
Verified working — step 1
The curve is symmetrical, so the maximum sits exactly halfway between the roots x = -5 and x = 2. Find that x, then substitute it into the equation.The full step-by-step working and final answer are included with Premium — checked against ECZ marking standards.
Original examination question © Examinations Council of Zambia. Worked solution and commentary © G12 Titan — not to be reproduced without permission.
Have a different question?
Search it — if it is from a past paper or a school mock, chances are we have it worked out, or one that uses the same method.
Search any past-paper question