ECZ 2021 · GCE Paper 1 — Quadratic Functions

The diagram shows a sketch of the graph of y = 5 − 4x − x². Find the maximum value of y.

Verified working — step 1

The maximum sits at the turning point - NOT at the y-intercept - and completing the square exposes it.

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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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