CPM Homework Help : A2C Problem 7-85

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7-85.

Given $f\left(x\right) = 2x^{2} − 4$ and $g\left(x\right) = 5x + 3$ , find the value of each expression below.

Hint:

Substitute the quantity inside the parentheses ( ) for $x$ into the $f\left(x\right)$ or $g\left(x\right)$ equation and simplify.

$f\left(a\right)$

$f\left(3a\right)$

$f\left(a + b\right)$
Answer (c):
$f\left(a + b\right) = 2a^{2} + 4ab + 2b^{2} − 4$

$f\left(x + 7\right)$

$f\left(5x + 3\right)$

$g\left(f\left(x\right)\right)$
Answer (f):
$f\left(g\left(x\right)\right) = 10x^{2} − 17$

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