Algebra Examples

$\sqrt{x + 2} \div \sqrt{5 - x}$

Step 1

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

$x + 2 \geq 0$

Step 2

Subtract $2$ from both sides of the inequality.

$x \geq - 2$

Step 3

Set the radicand in $\sqrt{5 - x}$ greater than or equal to $0$ to find where the expression is defined.

$5 - x \geq 0$

Step 4

Solve for $x$ .

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Step 4.1

Subtract $5$ from both sides of the inequality.

$- x \geq - 5$

Step 4.2

Divide each term in $- x \geq - 5$ by $- 1$ and simplify.

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Step 4.2.1

Divide each term in $- x \geq - 5$ by $- 1$ . When multiplying or dividing both sides of an inequality by a negative value, flip the direction of the inequality sign.

$\frac{- x}{- 1} \leq \frac{- 5}{- 1}$

Step 4.2.2

Simplify the left side.

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Step 4.2.2.1

Dividing two negative values results in a positive value.

$\frac{x}{1} \leq \frac{- 5}{- 1}$

Step 4.2.2.2

Divide $x$ by $1$ .

$x \leq \frac{- 5}{- 1}$

Step 4.2.3

Simplify the right side.

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Step 4.2.3.1

Divide $- 5$ by $- 1$ .

$x \leq 5$

Step 5

Set the denominator in $\sqrt{x + 2} \div \sqrt{5 - x}$ equal to $0$ to find where the expression is undefined.

$\sqrt{5 - x} = 0$

Step 6

Solve for $x$ .

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Step 6.1

To remove the radical on the left side of the equation, square both sides of the equation.

${\sqrt{5 - x}}^{2} = 0^{2}$

Step 6.2

Simplify each side of the equation.

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Step 6.2.1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{5 - x}$ as ${(5 - x)}^{\frac{1}{2}}$ .

${({(5 - x)}^{\frac{1}{2}})}^{2} = 0^{2}$

Step 6.2.2

Simplify the left side.

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Step 6.2.2.1

Simplify ${({(5 - x)}^{\frac{1}{2}})}^{2}$ .

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Step 6.2.2.1.1

Multiply the exponents in ${({(5 - x)}^{\frac{1}{2}})}^{2}$ .

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Step 6.2.2.1.1.1

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

${(5 - x)}^{\frac{1}{2} \cdot 2} = 0^{2}$

Step 6.2.2.1.1.2

Cancel the common factor of $2$ .

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Step 6.2.2.1.1.2.1

Cancel the common factor.

${(5 - x)}^{\frac{1}{2} \cdot 2} = 0^{2}$

Step 6.2.2.1.1.2.2

Rewrite the expression.

${(5 - x)}^{1} = 0^{2}$

Step 6.2.2.1.2

Simplify.

$5 - x = 0^{2}$

Step 6.2.3

Simplify the right side.

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Step 6.2.3.1

Raising $0$ to any positive power yields $0$ .

$5 - x = 0$

Step 6.3

Solve for $x$ .

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Step 6.3.1

Subtract $5$ from both sides of the equation.

$- x = - 5$

Step 6.3.2

Divide each term in $- x = - 5$ by $- 1$ and simplify.

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Step 6.3.2.1

Divide each term in $- x = - 5$ by $- 1$ .

$\frac{- x}{- 1} = \frac{- 5}{- 1}$

Step 6.3.2.2

Simplify the left side.

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Step 6.3.2.2.1

Dividing two negative values results in a positive value.

$\frac{x}{1} = \frac{- 5}{- 1}$

Step 6.3.2.2.2

Divide $x$ by $1$ .

$x = \frac{- 5}{- 1}$

Step 6.3.2.3

Simplify the right side.

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Step 6.3.2.3.1

Divide $- 5$ by $- 1$ .

$x = 5$

Step 7

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

Interval Notation:

$[- 2, 5)$

Set-Builder Notation:

${x | - 2 \leq x < 5}$

Step 8