# Math Help - Instantaneous rate of change

1. ## Instantaneous rate of change

Find the instantaneous rate of change at 3
f(x) = 3x²+5

Thank you.

2. Originally Posted by beachbunny619
Find the instantaneous rate of change at 3
f(x) = 3x²+5

Thank you.
$f'(x) = 2*3*x^1 + 0 = 6x$

f'(3) = 18