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WAEC Further Mathematics 2025 Question 22

Question 22

Differentiation

The gradient of point Q on the curve y = 7x2 + 2x + 1 is 30. Find the coordinate of Q.

  1. A.(2, 33)
  2. B.(4, 30)
  3. C.(6, 11)
  4. D.(9, 17)
Show the answer and explanation

Answer: A ((2, 33))

Explanation

dy/dx = 14x + 2 = 30 gives x = 2, and y = 28 + 4 + 1 = 33.