ECZ 2019 · GCE Paper 1 — Quadratic Functions
A function y = (1 + x)(x − 2), i.e. y = x² − x − 2. Find the minimum value of y.
- A. −2
- B. −94
- C. −12
- D. −3
Verified working — step 1
The minimum sits on the axis of symmetry, midway between the roots −1 and 2: x = ½. Substituting: y = (½)² − ½ − 2 = ¼ − ½ − 2 = …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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