Question

If f(x)=3x^2 then f(-2)=?

Answer 1

`f(-2)=12`

Explanation:

`f(x)=3x^2`

To find `f(-2)` you just need to put `-2` instead of `x`:

`f(-2)=3(-2)^2=3*4=12`

Answer 2

`f(-2) = 12`

Explanation:

All we need to do here is substitute the number in parentheses (`-2`) for `x` in the function:

`f(-2) = 3(-2)^2 = 3(4) = 12`

Note that the negative symbol from the `-2` is included in the parentheses for the exponent.