## Calculus Concepts: An Informal Approach to the Mathematics of Change 5th Edition

$g'(x)=18x^{-3}$
First you have to re-write this number before you can take its derivative. You re-write it as $-9x^{-2}$ Then you take the derivative of that number by applying the derivative rule. A number with an x variable, you take the exponent, multiply it with the number in front, then subtract one from the exponent.