ECZ 2021 · O-Level Paper 1 — Relations and Functions
The functions f and g are defined by f(x) = x + 92and g(x) = x − 2. Find fg(−5).
- A. 0
- B. 2
- C. −1
- D. 1
Verified working — step 1
g(−5) = −5 − 2 = −7, then f(−7) = −7 + 92= 22= 1. Equivalently fg(x) = x + 72, so fg(−5) = 22= …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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