CPM Homework Help : CCA Problem 3-86

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3-86.

If $f\left(x\right)=7+\left|x\right|$ and $g\left(x\right)=x^3-5$ , then find:

$f\left(-5\right)$
Hint (a):
Substitute the value for $x$ .
$f\left(-5\right)=7+\left|-5\right|=7+5=12$

$g\left(4\right)$
Hint (b):
Substitute the value for $x$ .
$g\left(4\right)=4^3-5=64-5=59$

$f\left(0\right)$
Hint (c):
Substitute the value for $x$ .
$f\left(0\right)=7+\left|0\right|=7+0=7$

$f\left(2\right)$
Hint (d):
See parts (a) and (c).

$g\left(-2\right)$
Hint (e):
Substitute the value for $x$ .
$g\left(-2\right)=\left(-2\right)^3-5=-8-5=-13$

$g\left(0\right)$
Hint (f):
See parts (b) and (e).

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