ECZ 2016 · O-Level Paper 1 — Relations and Functions
Using f(x) = (5x + 4)⁄5, find f⁻¹(−2).
- A. −6⁄5
- B. 14⁄5
- C. −2
- D. −14⁄5
Verified working — step 1
f⁻¹(x) = (5x − 4)⁄5, so f⁻¹(−2) = (5 × −2 − 4)⁄5 = (−14)⁄5 = …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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