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

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Answer 1 · 2018-04-30T15:52:57

$f (- 2) = 12$ $f(-2)=12$

$f (x) = 3 x^{2}$ $f(x)=3x^2$

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

$f (- 2) = 3 {(- 2)}^{2} = 3 \cdot 4 = 12$ $f(-2)=3(-2)^2=3*4=12$

Answer 2 · 2018-04-30T15:56:29

$f (- 2) = 12$ $f(-2) = 12$

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

$f (- 2) = 3 {(- 2)}^{2} = 3 (4) = 12$ $f(-2) = 3(-2)^2 = 3(4) = 12$

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