Precalculus Examples

$f (x) = x^{2} - 1$ , $g (x) = 2 x$

Step 1

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

$x^{2} - 1 + 2 x$

Step 2

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:

${x | x \in ℝ}$

Step 3

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