ECZ 2020 · O-Level Paper 1 — Relations and Functions
The functions f and g are defined by f(x) = 3x - 2 and g(x) = 4x + 1. Find (a) f⁻¹(x).
- A. x - 23
- B. 13x - 2
- C. 3x + 2
- D. x + 23
Verified working — step 1
Let y = 3x - 2. Then 3x = y + 2, so x = y + 23. Therefore f⁻¹(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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