ECZ 2014 · O-Level Paper 1 — Relations and Functions
A function is defined by f(x) = 10x + 9. Find f(−2).
- A. −20
- B. 29
- C. 11
- D. −11
Verified working — step 1
f(−2) = 10 × −2 + 9 = −20 + 9 = …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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