# A function #f(x)# is defined as #f(x) = -8x^2#. What is #f(-3)#?

##### 1 Answer

Jun 20, 2018

#### Explanation:

#"to evaluate "f(-3)" substitute "x=-3" into "f(x)#

#f(color(red)(-3))=-8xx(color(red)(-3))^2=-8xx9=-72#