Algebra Examples

$f (x) = \sqrt{2 - x}$

Set the radicand in $\sqrt{2 - x}$ greater than or equal to $0$ to find where the expression is defined.

$2 - x \geq 0$

Solve for $x$ .

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Subtract $2$ from both sides of the inequality.

$- x \geq - 2$

Divide each term in $- x \geq - 2$ by $- 1$ and simplify.

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Divide each term in $- x \geq - 2$ by $- 1$ . When multiplying or dividing both sides of an inequality by a negative value, flip the direction of the inequality sign.

$\frac{- x}{- 1} \leq \frac{- 2}{- 1}$

Simplify the left side.

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Dividing two negative values results in a positive value.

$\frac{x}{1} \leq \frac{- 2}{- 1}$

Divide $x$ by $1$ .

$x \leq \frac{- 2}{- 1}$

Simplify the right side.

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Divide $- 2$ by $- 1$ .

$x \leq 2$

The domain is all values of $x$ that make the expression defined.

Interval Notation:

$(- \infty, 2]$

Set-Builder Notation:

${x | x \leq 2}$

The range is the set of all valid $y$ values. Use the graph to find the range.

Interval Notation:

$[0, \infty)$

Set-Builder Notation:

${y | y \geq 0}$

Determine the domain and range.

Domain: $(- \infty, 2], {x | x \leq 2}$

Range: $[0, \infty), {y | y \geq 0}$