CPM Homework Help : GB8I Problem 2-65

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2-65.

Calculate $f (−3)$ for each function below.

$f(x) = −2x + 3$
Hint (a):
Substitute $−3$ for $x$ and then simplify.

$f(x) = 4^x$
Hint (b):
Substitute $−3$ for $x$ and then simplify.
More Help (b):
$f(-3)=4^{-3}$
$f(-3)=\frac{1}{4^{3}}$

$f(x) = x^{−2} + 1$
Hint (c):
See Hint for part (a).

$f(x) = \frac{1}{2}x + 2$
Hint (d):
See Hint for part (a).
Answer (d):
$\frac{1}{2}$

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