Precalculus Examples

$f (n) = n^{2} + 4 n$ $g (n) = - n - 5$ Find $f (n) + g (n)$

Step 1

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

$n^{2} + 4 n - n - 5$

Step 2

Simplify $n^{2} + 4 n - n - 5$ .

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Step 2.1

Remove parentheses.

$n^{2} + 4 n - n - 5$

Step 2.2

Subtract $n$ from $4 n$ .

$n^{2} + 3 n - 5$