Finite Math Examples

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

Find the product of the functions.

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

$(x) \cdot (2 x)$

Simplify.

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Rewrite using the commutative property of multiplication.

$2 x \cdot x$

Multiply $x$ by $x$ by adding the exponents.

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Move $x$ .

$2 (x \cdot x)$

Multiply $x$ by $x$ .

$2 x^{2}$

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:

${x | x \in ℝ}$

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