ECZ 2017 · O-Level Paper 1 — Relations and Functions
The functions f and g are defined by f(x) = 2x + 1 and g(x) = 5x − 1. Find fg(x).
- A. 7x
- B. 10x − 1
- C. 10x + 1
- D. 10x − 2
Verified working — step 1
fg(x) means f(g(x)) = f(5x − 1) = 2(5x − 1) + 1 = …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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