ECZ 2018 · GCE Paper 1 — Relations and Functions
Given that f(x) = 8x and g(x) = 3x − 24, find the value of x for which fg(x) = 20.
- A. 83
- B. 24
- C. 4
- D. 3
Verified working — step 1
Build the single rule for fg first, then solve the equation it gives. In fg(x) the function written nearest to x acts first: apply g, then feed the whole result into f.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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