ECZ 2026 · GCE Paper 1 — Relations and Functions
Given that f(x) = 2x - 9 and g(x) = x + 5, find f-1(x).
- A. x - 92
- B. 2x + 9
- C. 2 - 9xx
- D. 9x + 2x
Verified working — step 1
f-1 runs f backwards. Set y = f(x), make x the subject, then rename y as 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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