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 gf(-2).
- A. 31
- B. -31
- C. -17
- D. 17
Verified working — step 1
Build the composite rule first, then substitute. In gf, the function written nearest to x acts first, so f goes in before g.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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