Question

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

Answer 1

See the entire solution process below:

Explanation:

To calculate `f(-3)`, substitute `color(red)(-3)` for each occurrence of `color(red)(x)` in `f(x)` can calculate the result:

`f(color(red)(x)) = -8color(red)(x)^2` becomes:

`f(color(red)(-3)) = -8 xx color(red)(-3)^2`

`f(color(red)(-3)) = -8 xx 9`

`f(color(red)(-3)) = -72`