CPM Homework Help : AC Problem 12-21

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Home > AC > Chapter 12 > Lesson 12.1.2 > Problem 12-21

12-21.

If $f\left(x\right)=3x-9$ and $g\left(x\right)=-x^2$ , find:

$f\left(-2\right)$
Hint (a):
Substitute the value for $x$ .
$f\left(-2\right)=3\left(-2\right)-9$
Continue to simplify.

$g\left(-2\right)$
Hint (b):
Substitute the value for $x$ .
$g\left(-2\right)=-\left(-2\right)^2$

$x$ if $f\left(x\right)=0$
Hint (c):
Substitute $0$ for $f\left(x\right)$ .
$0=3x-9$

$g\left(m\right)$
Answer (d):
Substitute the value for $x$ .
$g\left(m\right)=-m^2$

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