Finite Math Examples

$f (x) = \frac{x - 4}{\sqrt{x + 2}}$

Step 1

Set the denominator in $\frac{x - 4}{\sqrt{x + 2}}$ equal to $0$ to find where the expression is undefined.

$\sqrt{x + 2} = 0$

Step 2

Solve for $x$ .

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Step 2.1

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

${\sqrt{x + 2}}^{2} = 0^{2}$

Step 2.2

Simplify each side of the equation.

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Step 2.2.1

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

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

Step 2.2.2

Simplify the left side.

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Step 2.2.2.1

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

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Step 2.2.2.1.1

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

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Step 2.2.2.1.1.1

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

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

Step 2.2.2.1.1.2

Cancel the common factor of $2$ .

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Step 2.2.2.1.1.2.1

Cancel the common factor.

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

Step 2.2.2.1.1.2.2

Rewrite the expression.

${(x + 2)}^{1} = 0^{2}$

Step 2.2.2.1.2

Simplify.

$x + 2 = 0^{2}$

Step 2.2.3

Simplify the right side.

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Step 2.2.3.1

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

$x + 2 = 0$

Step 2.3

Subtract $2$ from both sides of the equation.

$x = - 2$

Step 3

Set the radicand in $\sqrt{x + 2}$ less than $0$ to find where the expression is undefined.

$x + 2 < 0$

Step 4

Subtract $2$ from both sides of the inequality.

$x < - 2$

Step 5

The equation is undefined where the denominator equals $0$ , the argument of a square root is less than $0$ , or the argument of a logarithm is less than or equal to $0$ .

$x \leq - 2$

$(- \infty, - 2]$

Step 6