Question

Find the derivative of f(x) = 8x + 4 at x = 9.

Answer 1

The derivative is a constant, so what ever x value, it will always be the same gradient.

Answer 2

The derivative is just a flashy term for the gradient of the curve at any particular point.

Answer 3

8

Answer 4

Uhhh... :/ don't understand

Answer 5

In this case, your curve is a line, so there would be a constant gradient regardless what point lies on the line.

Answer 6

Thanks timo, but how do I find it?

Answer 7

first step, azteck?

Answer 8

well use differential calculus

Answer 9

Example, the gradient of a line is always constant!