ECZ 2011 · O-Level Paper 1 — Quadratic Equations
Solve the equation (y + 7)2 = 9.
- A. y = 2 or y = -16
- B. y = -4 or y = -10
- C. y = -4 only
- D. y = 3 or y = -3
Verified working — step 1
Take the square root of both sides: y + 7 = 3 or y + 7 = -3, so y = -4 or y = …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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