Precalculus Examples

$f (x) = x$ , $g (x) = 2 x$

Find the sum of the functions.

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

$x + 2 x$

Add $x$ and $2 x$ .

$3 x$

The domain of the expression is all real numbers except where the expression is undefined. In this case, there is no real number that makes the expression undefined.

Interval Notation:

$(- \infty, \infty)$

Set-Builder Notation:

${x | x \in ℝ}$

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