Question

How to find instantaneous rate of change for `f(x) = x^2 + 3x + 4` when x=4?

Answer 1

11

Explanation:

This is just the value of f'(x) at x = 4

f'(x) = 2x + 3

and f'(4) = 2(4) + 3 = 8 + 3 = 11