Question 35
DifferentiationIf the gradient of the curve y = 2kx2 + x + 1 at x = 1 is 9, find k.
- A.1
- B.2
- C.3
- D.4
Show the answer and explanation
Answer: B (2)
Explanation
dy/dx = 4kx + 1. At x = 1, 4k + 1 = 9, so k = 2.
If the gradient of the curve y = 2kx2 + x + 1 at x = 1 is 9, find k.
Answer: B (2)
dy/dx = 4kx + 1. At x = 1, 4k + 1 = 9, so k = 2.