ECZ 2018 · GCE Paper 1 — Quadratic Equations
Solve the equation (2x − 1)² = 25.
- A. x = 3 only
- B. x = −2 or x = 3
- C. x = −3 or x = 2
- D. x = 13 or x = −12
Verified working — step 1
Take square roots of both sides, remembering both signs: 2x − 1 = ±5. Then 2x = 6 giving x = 3, or 2x = −4 giving x = …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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