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(−3).
- A. 29
- B. −29
- C. −31
- D. 31
Verified working — step 1
Build the composite rule fg(x) first, then substitute x = -3 into it.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.
Have a different question?
Search it — if it is from a past paper or a school mock, chances are we have it worked out, or one that uses the same method.
Search any past-paper question