ECZ 2014 · O-Level Paper 1 — Quadratic Functions

Given that y = kx² − 1, where k is a constant, and that y = 17 when x = 3, find the value of k.

Verified working — step 1

Substitute the known pair (x = 3, y = 17) and solve for k - squaring the 3 before anything touches k.

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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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