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WAEC Further Mathematics 2021 Question 33

Question 33

Differentiation

The gradient of y = 3x2 + 11x + 7 at P(x, y) is −1. Find the coordinates of P.

  1. A.(−3, −2)
  2. B.(−2, −3)
  3. C.(−2, 3)
  4. D.(−1, −5/2)
Show the answer and explanation

Answer: B ((−2, −3))

Explanation

6x + 11 = −1 gives x = −2; y = 12 − 22 + 7 = −3. P = (−2, −3).