ECZ 2020 · O-Level Paper 1 — Algebra
Factorise completely 16x² - 100.
- A. 4(x - 5)(x + 5)
- B. (4x - 10)(4x + 10)
- C. 4(2x - 5)(2x + 5)
- D. (2x - 5)(2x + 5)
Verified working — step 1
16x² - 100 = 4(4x² - 25) = 4((2x)² - 5²) = …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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