ECZ 2011 · O-Level Paper 1 — Algebra

Given that x = -4 and y = -12, find the value of xy - x².

Verified working — step 1

Substitute in brackets - the product of two negatives is positive, and the square wipes out a minus.

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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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