ECZ 2023 · O-Level Paper 1 — Relations and Functions
The functions g and h are defined by g(x) = 3x + 1 and h(x) = x - 12. Find g-1(x).
- A. x + 13
- B. 3x - 1
- C. x - 13
- D. x - 31
Verified working — step 1
The inverse undoes g. The recipe: swap x and y, then make y the subject.The full step-by-step working and final answer, plus the video lesson for this topic, 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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