CPM Homework Help : CCA2 Problem 3-109

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3-109.

If $f(x) = 3x − 9$ and $g(x) = −x^2$ , find:

$f(−2)$
Hint (a):
Substitute $−2$ for $x$ .
Answer (a):
$f(−2) = −15$

$g(-2)$
Hint (b):
Substitute $−2$ for $x$ .
Step (b):
$g(-2) = -(-2)^2$
Answer (b):
$g(-2) = -4$

$x \text{ if } f(x) = 0$
Hint (c):
Substitute $0$ for $f(x)$ .
Solve for $x$ .

$g(m)$
Hint (d):
Substitute $m$ for $x$ .

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