ECZ 2023 · GCE Paper 1 — Quadratic Functions
The diagram shows the graph of the function y = x2 + 2x − 15. The curve cuts the x-axis at A and B and the y-axis at C. Find the minimum value of y.
- A. −15
- B. −1
- C. −17
- D. −16
Verified working — step 1
The minimum sits at the turning point - which is NOT the y-intercept; the curve dips below C before rising.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