ECZ 2014 · O-Level Paper 1 — Relations and Functions
A function is defined by f(x) = 10x + 9. Find k, if f(k) = k.
- A. k = −9
- B. k = 1
- C. k = −911
- D. k = −1
Verified working — step 1
f(k) = 10k + 9 = k. Subtracting k gives 9k + 9 = 0, so 9k = −9 and k = …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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