Precalculus Examples

$f (x) = 9 - 3 x$ $g (x) = 5 x - 7$ Find $f (x) + g (x)$

Step 1

Replace the function designators in $f (x) + g (x)$ with the actual functions.

$9 - 3 x + 5 x - 7$

Step 2

Simplify $9 - 3 x + 5 x - 7$ .

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Step 2.1

Simplify the expression.

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Step 2.1.1

Remove parentheses.

$9 - 3 x + 5 x - 7$

Step 2.1.2

Subtract $7$ from $9$ .

$- 3 x + 5 x + 2$

Step 2.2

Add $- 3 x$ and $5 x$ .

$2 x + 2$