Precalculus Examples

$\frac{4 x}{9 x^{\frac{1}{2}}}$

Step 1

Convert expressions with fractional exponents to radicals.

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Step 1.1

Apply the rule $x^{\frac{m}{n}} = \sqrt[n]{x^{m}}$ to rewrite the exponentiation as a radical.

$\frac{4 x}{9 \sqrt{x^{1}}}$

Step 1.2

Anything raised to $1$ is the base itself.

$\frac{4 x}{9 \sqrt{x}}$

Step 2

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

$x \geq 0$

Step 3

Set the denominator in $\frac{4 x}{9 \sqrt{x}}$ equal to $0$ to find where the expression is undefined.

$9 \sqrt{x} = 0$

Step 4

Solve for $x$ .

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Step 4.1

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

${(9 \sqrt{x})}^{2} = 0^{2}$

Step 4.2

Simplify each side of the equation.

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Step 4.2.1

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

${(9 x^{\frac{1}{2}})}^{2} = 0^{2}$

Step 4.2.2

Simplify the left side.

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Step 4.2.2.1

Simplify ${(9 x^{\frac{1}{2}})}^{2}$ .

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Step 4.2.2.1.1

Apply the product rule to $9 x^{\frac{1}{2}}$ .

$9^{2} {(x^{\frac{1}{2}})}^{2} = 0^{2}$

Step 4.2.2.1.2

Raise $9$ to the power of $2$ .

$81 {(x^{\frac{1}{2}})}^{2} = 0^{2}$

Step 4.2.2.1.3

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

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Step 4.2.2.1.3.1

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

$81 x^{\frac{1}{2} \cdot 2} = 0^{2}$

Step 4.2.2.1.3.2

Cancel the common factor of $2$ .

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Step 4.2.2.1.3.2.1

Cancel the common factor.

$81 x^{\frac{1}{2} \cdot 2} = 0^{2}$

Step 4.2.2.1.3.2.2

Rewrite the expression.

$81 x^{1} = 0^{2}$

Step 4.2.2.1.4

Simplify.

$81 x = 0^{2}$

Step 4.2.3

Simplify the right side.

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Step 4.2.3.1

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

$81 x = 0$

Step 4.3

Divide each term in $81 x = 0$ by $81$ and simplify.

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Step 4.3.1

Divide each term in $81 x = 0$ by $81$ .

$\frac{81 x}{81} = \frac{0}{81}$

Step 4.3.2

Simplify the left side.

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Step 4.3.2.1

Cancel the common factor of $81$ .

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Step 4.3.2.1.1

Cancel the common factor.

$\frac{81 x}{81} = \frac{0}{81}$

Step 4.3.2.1.2

Divide $x$ by $1$ .

$x = \frac{0}{81}$

Step 4.3.3

Simplify the right side.

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Step 4.3.3.1

Divide $0$ by $81$ .

$x = 0$

Step 5

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

Interval Notation:

$(0, \infty)$

Set-Builder Notation:

${x | x > 0}$

Step 6