If the gradient of the curve y = 2kx2 + x + 1 at x…

Home » Past Questions » Mathematics » Jamb » 2001 » If the gradient of the curve y = 2kx2 + x + 1 at x…
Mathematics JAMB 2001

If the gradient of the curve y = 2kx2 + x + 1 at x = 1 is 9, find k.

  • 4
  • 3
  • 2 checkmark
  • 1

The correct answer is: C

Explanation

y = 2kx2 + x + 1
Gradient function dy/dx = 4kx + 1
at dy/dx = 9, => 9 = 4kx + 1
=> 8 = 4kx, and k = 8/4x.

At x = 1, k = 8/4 = 2

There is an explanation video available .

Previous Question Next Question

Leave A Comment