ECZ 2018 · GCE Paper 1 — Quadratic Functions
The diagram shows a sketch of the parabola y = x² + 2x − 8, which meets the x-axis at −4 and 2. Find the coordinates of the turning point.
- A. (−1, −5)
- B. (1, −9)
- C. (−1, −9)
- D. (−2, −8)
Verified working — step 1
By symmetry the turning point lies midway between the roots: x = −4 + 22= −1. Substituting: y = (−1)² + 2(−1) − 8 = 1 − 2 − 8 = …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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