WAEC Further Mathematics 2024 Objective — Question 15
Question 15 of 40 from the West African Examinations Council (WAEC) Further Mathematics 2024 Objective paper, with the correct answer and a full explanation.
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15. The gradient of the curve y=mx^2+3x-1 at the point (-1,1) is 9. Find the value of m.
- A. -3 B.-5/4Correct
- B. C.5/4
- C. D.3 (see note)
- D. (options as printed are irregular; correct value is m = -3)
Explanation
dy/dx=2mx+3. At (-1,1): 2m(-1)+3=9 => -2m=6 => m=-3.
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