ECZ 2023 · GCE Paper 1 — Quadratic Functions
The diagram shows the graph of the function y = x² + 2x − 15. Find the minimum value of y.
- A. −15
- B. −1
- C. −17
- D. −16
Verified working — step 1
The turning point is at x = −b2a= −22= −1. Then y = (−1)² + 2(−1) − 15 = 1 − 2 − 15 = …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.
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