ECZ 2014 · O-Level Paper 1 — Algebra
Factorise completely 5x2 − x − 4.
- A. (5x + 4)(x − 1)
- B. (5x − 4)(x + 1)
- C. (x + 4)(5x − 1)
- D. (5x + 2)(x − 2)
Verified working — step 1
Hunt for two numbers that multiply to 5 × (-4) = -20 and add to -1, then split the middle term with them.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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