ECZ 2022 · O-Level Paper 1 — Relations and Functions
Given that f(x) = 3x + 1 and g(x) = 4x - 1, find f-1(-5).
- A. 2
- B. -1.33
- C. -16
- D. -2
Verified working — step 1
Find the inverse rule for f first, then substitute, minding the signs. 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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