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

Question

10144 views around the world

You can reuse this answer
Creative Commons License

Answer 1 · 2018-04-30T15:52:57

$f(-2)=12$

$f(x)=3x^2$

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

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

Answer 2 · 2018-04-30T15:56:29

$f(-2) = 12$

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.