## Derivative : solution of exercise 3.17 - Basic math level

### To find the derivative of *f(x) = 7/(x*^{2} - 9)^{0.5} you can use the quotient rule or consider that *f(x) = 7*(x*^{2} - 9)^{-0.5} and use directly the rule to find the derivative of composite functions which is called the chain rule.