ECZ 2020 · O-Level Paper 1 — Quadratic Functions

The diagram below shows the sketch of the graph of y = -x² + 2x + 3 cutting the x-axis at A and B. Find the (ii) maximum value of the graph.

Verified working — step 1

The maximum sits at the turning point: find its x from -b2a, then substitute back for the VALUE the question wants.

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Original examination question © Examinations Council of Zambia. Worked solution and commentary © G12 Titan — not to be reproduced without permission.

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