ECZ 2025 · GCE Paper 1 — Relations and Functions
The functions f and g are defined by f(x) = x + 32 and g(x) = 1 - 2x. Find gf(-7).
- A. 11
- B. 5
- C. -11
- D. -5
Verified working — step 1
Build the composite rule first, then substitute - and mind the double negative. In gf(x) the function written nearest to x acts first: apply f, then feed the whole result into 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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