ECZ 2020 · GCE Paper 1 — Relations and Functions
A function f is defined by f(x) = 2x - 5. Find the value of x for which ff(x) = x.
- A. 0
- B. 53
- C. 15
- D. 5
Verified working — step 1
ff means f applied twice - build that composite rule first, then solve the equation it gives.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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