ECZ 2021 · GCE Paper 1 — Relations and Functions
The functions f and g are defined by f(x) = x − 34and g(x) = 2x + 1. Find f⁻¹(x).
- A. 4x + 3
- B. x + 34
- C. 4x − 3
- D. 4x − 3
Verified working — step 1
Let y = x − 34. Then 4y = x − 3 and x = 4y + 3. Swapping the letters gives 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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