ECZ 2015 · O-Level Paper 1 — Algebra
Factorise 2x² − x − 15.
- A. (2x − 5)(x + 3)
- B. (2x + 5)(x − 3)
- C. (2x + 3)(x − 5)
- D. (2x − 3)(x + 5)
Verified working — step 1
Find two numbers multiplying to 2 × (−15) = −30 and adding to −1: they are −6 and 5. Split: 2x² − 6x + 5x − 15 = 2x(x − 3) + 5(x − 3) = …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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