Precalculus Examples

$\frac{1}{2} \cdot (x^{- \frac{1}{2}} {(5 x + 8)}^{\frac{1}{2}}) - \frac{5}{2} \cdot (x^{\frac{1}{2}} {(5 x + 8)}^{\frac{- 1}{2}})$

Step 1

Simplify each term.

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Step 1.1

Rewrite the expression using the negative exponent rule $b^{- n} = \frac{1}{b^{n}}$ .

$\frac{1}{2} \cdot (\frac{1}{x^{\frac{1}{2}}} {(5 x + 8)}^{\frac{1}{2}}) - \frac{5}{2} \cdot (x^{\frac{1}{2}} {(5 x + 8)}^{\frac{- 1}{2}})$

Step 1.2

Combine $\frac{1}{x^{\frac{1}{2}}}$ and ${(5 x + 8)}^{\frac{1}{2}}$ .

$\frac{1}{2} \cdot \frac{{(5 x + 8)}^{\frac{1}{2}}}{x^{\frac{1}{2}}} - \frac{5}{2} \cdot (x^{\frac{1}{2}} {(5 x + 8)}^{\frac{- 1}{2}})$

Step 1.3

Combine.

$\frac{1 {(5 x + 8)}^{\frac{1}{2}}}{2 x^{\frac{1}{2}}} - \frac{5}{2} \cdot (x^{\frac{1}{2}} {(5 x + 8)}^{\frac{- 1}{2}})$

Step 1.4

Multiply ${(5 x + 8)}^{\frac{1}{2}}$ by $1$ .

$\frac{{(5 x + 8)}^{\frac{1}{2}}}{2 x^{\frac{1}{2}}} - \frac{5}{2} \cdot (x^{\frac{1}{2}} {(5 x + 8)}^{\frac{- 1}{2}})$

Step 1.5

Move the negative in front of the fraction.

$\frac{{(5 x + 8)}^{\frac{1}{2}}}{2 x^{\frac{1}{2}}} - \frac{5}{2} \cdot (x^{\frac{1}{2}} {(5 x + 8)}^{- \frac{1}{2}})$

Step 1.6

Rewrite the expression using the negative exponent rule $b^{- n} = \frac{1}{b^{n}}$ .

$\frac{{(5 x + 8)}^{\frac{1}{2}}}{2 x^{\frac{1}{2}}} - \frac{5}{2} \cdot (x^{\frac{1}{2}} \frac{1}{{(5 x + 8)}^{\frac{1}{2}}})$

Step 1.7

Combine $x^{\frac{1}{2}}$ and $\frac{1}{{(5 x + 8)}^{\frac{1}{2}}}$ .

$\frac{{(5 x + 8)}^{\frac{1}{2}}}{2 x^{\frac{1}{2}}} - \frac{5}{2} \cdot \frac{x^{\frac{1}{2}}}{{(5 x + 8)}^{\frac{1}{2}}}$

Step 1.8

Multiply $\frac{x^{\frac{1}{2}}}{{(5 x + 8)}^{\frac{1}{2}}}$ by $\frac{5}{2}$ .

$\frac{{(5 x + 8)}^{\frac{1}{2}}}{2 x^{\frac{1}{2}}} - \frac{x^{\frac{1}{2}} \cdot 5}{{(5 x + 8)}^{\frac{1}{2}} \cdot 2}$

Step 1.9

Move $5$ to the left of $x^{\frac{1}{2}}$ .

$\frac{{(5 x + 8)}^{\frac{1}{2}}}{2 x^{\frac{1}{2}}} - \frac{5 \cdot x^{\frac{1}{2}}}{{(5 x + 8)}^{\frac{1}{2}} \cdot 2}$

Step 1.10

Move $2$ to the left of ${(5 x + 8)}^{\frac{1}{2}}$ .

$\frac{{(5 x + 8)}^{\frac{1}{2}}}{2 x^{\frac{1}{2}}} - \frac{5 x^{\frac{1}{2}}}{2 {(5 x + 8)}^{\frac{1}{2}}}$

Step 2

To write $\frac{{(5 x + 8)}^{\frac{1}{2}}}{2 x^{\frac{1}{2}}}$ as a fraction with a common denominator, multiply by $\frac{{(5 x + 8)}^{\frac{1}{2}}}{{(5 x + 8)}^{\frac{1}{2}}}$ .

$\frac{{(5 x + 8)}^{\frac{1}{2}}}{2 x^{\frac{1}{2}}} \cdot \frac{{(5 x + 8)}^{\frac{1}{2}}}{{(5 x + 8)}^{\frac{1}{2}}} - \frac{5 x^{\frac{1}{2}}}{2 {(5 x + 8)}^{\frac{1}{2}}}$

Step 3

To write $- \frac{5 x^{\frac{1}{2}}}{2 {(5 x + 8)}^{\frac{1}{2}}}$ as a fraction with a common denominator, multiply by $\frac{x^{\frac{1}{2}}}{x^{\frac{1}{2}}}$ .

$\frac{{(5 x + 8)}^{\frac{1}{2}}}{2 x^{\frac{1}{2}}} \cdot \frac{{(5 x + 8)}^{\frac{1}{2}}}{{(5 x + 8)}^{\frac{1}{2}}} - \frac{5 x^{\frac{1}{2}}}{2 {(5 x + 8)}^{\frac{1}{2}}} \cdot \frac{x^{\frac{1}{2}}}{x^{\frac{1}{2}}}$

Step 4

Write each expression with a common denominator of $2 x^{\frac{1}{2}} {(5 x + 8)}^{\frac{1}{2}}$ , by multiplying each by an appropriate factor of $1$ .

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Step 4.1

Multiply $\frac{{(5 x + 8)}^{\frac{1}{2}}}{2 x^{\frac{1}{2}}}$ by $\frac{{(5 x + 8)}^{\frac{1}{2}}}{{(5 x + 8)}^{\frac{1}{2}}}$ .

$\frac{{(5 x + 8)}^{\frac{1}{2}} {(5 x + 8)}^{\frac{1}{2}}}{2 x^{\frac{1}{2}} {(5 x + 8)}^{\frac{1}{2}}} - \frac{5 x^{\frac{1}{2}}}{2 {(5 x + 8)}^{\frac{1}{2}}} \cdot \frac{x^{\frac{1}{2}}}{x^{\frac{1}{2}}}$

Step 4.2

Multiply $\frac{5 x^{\frac{1}{2}}}{2 {(5 x + 8)}^{\frac{1}{2}}}$ by $\frac{x^{\frac{1}{2}}}{x^{\frac{1}{2}}}$ .

$\frac{{(5 x + 8)}^{\frac{1}{2}} {(5 x + 8)}^{\frac{1}{2}}}{2 x^{\frac{1}{2}} {(5 x + 8)}^{\frac{1}{2}}} - \frac{5 x^{\frac{1}{2}} x^{\frac{1}{2}}}{2 {(5 x + 8)}^{\frac{1}{2}} x^{\frac{1}{2}}}$

Step 4.3

Reorder the factors of $2 {(5 x + 8)}^{\frac{1}{2}} x^{\frac{1}{2}}$ .

$\frac{{(5 x + 8)}^{\frac{1}{2}} {(5 x + 8)}^{\frac{1}{2}}}{2 x^{\frac{1}{2}} {(5 x + 8)}^{\frac{1}{2}}} - \frac{5 x^{\frac{1}{2}} x^{\frac{1}{2}}}{2 x^{\frac{1}{2}} {(5 x + 8)}^{\frac{1}{2}}}$

Step 5

Combine the numerators over the common denominator.

$\frac{{(5 x + 8)}^{\frac{1}{2}} {(5 x + 8)}^{\frac{1}{2}} - 5 x^{\frac{1}{2}} x^{\frac{1}{2}}}{2 x^{\frac{1}{2}} {(5 x + 8)}^{\frac{1}{2}}}$

Step 6

Simplify the numerator.

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Step 6.1

Multiply ${(5 x + 8)}^{\frac{1}{2}}$ by ${(5 x + 8)}^{\frac{1}{2}}$ by adding the exponents.

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Step 6.1.1

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$\frac{{(5 x + 8)}^{\frac{1}{2} + \frac{1}{2}} - 5 x^{\frac{1}{2}} x^{\frac{1}{2}}}{2 x^{\frac{1}{2}} {(5 x + 8)}^{\frac{1}{2}}}$

Step 6.1.2

Combine the numerators over the common denominator.

$\frac{{(5 x + 8)}^{\frac{1 + 1}{2}} - 5 x^{\frac{1}{2}} x^{\frac{1}{2}}}{2 x^{\frac{1}{2}} {(5 x + 8)}^{\frac{1}{2}}}$

Step 6.1.3

Add $1$ and $1$ .

$\frac{{(5 x + 8)}^{\frac{2}{2}} - 5 x^{\frac{1}{2}} x^{\frac{1}{2}}}{2 x^{\frac{1}{2}} {(5 x + 8)}^{\frac{1}{2}}}$

Step 6.1.4

Divide $2$ by $2$ .

$\frac{{(5 x + 8)}^{1} - 5 x^{\frac{1}{2}} x^{\frac{1}{2}}}{2 x^{\frac{1}{2}} {(5 x + 8)}^{\frac{1}{2}}}$

Step 6.2

Simplify ${(5 x + 8)}^{1}$ .

$\frac{5 x + 8 - 5 x^{\frac{1}{2}} x^{\frac{1}{2}}}{2 x^{\frac{1}{2}} {(5 x + 8)}^{\frac{1}{2}}}$

Step 6.3

Multiply $x^{\frac{1}{2}}$ by $x^{\frac{1}{2}}$ by adding the exponents.

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Step 6.3.1

Move $x^{\frac{1}{2}}$ .

$\frac{5 x + 8 - 5 (x^{\frac{1}{2}} x^{\frac{1}{2}})}{2 x^{\frac{1}{2}} {(5 x + 8)}^{\frac{1}{2}}}$

Step 6.3.2

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$\frac{5 x + 8 - 5 x^{\frac{1}{2} + \frac{1}{2}}}{2 x^{\frac{1}{2}} {(5 x + 8)}^{\frac{1}{2}}}$

Step 6.3.3

Combine the numerators over the common denominator.

$\frac{5 x + 8 - 5 x^{\frac{1 + 1}{2}}}{2 x^{\frac{1}{2}} {(5 x + 8)}^{\frac{1}{2}}}$

Step 6.3.4

Add $1$ and $1$ .

$\frac{5 x + 8 - 5 x^{\frac{2}{2}}}{2 x^{\frac{1}{2}} {(5 x + 8)}^{\frac{1}{2}}}$

Step 6.3.5

Divide $2$ by $2$ .

$\frac{5 x + 8 - 5 x^{1}}{2 x^{\frac{1}{2}} {(5 x + 8)}^{\frac{1}{2}}}$

Step 6.4

Simplify $- 5 x^{1}$ .

$\frac{5 x + 8 - 5 x}{2 x^{\frac{1}{2}} {(5 x + 8)}^{\frac{1}{2}}}$

Step 6.5

Subtract $5 x$ from $5 x$ .

$\frac{0 + 8}{2 x^{\frac{1}{2}} {(5 x + 8)}^{\frac{1}{2}}}$

Step 6.6

Add $0$ and $8$ .

$\frac{8}{2 x^{\frac{1}{2}} {(5 x + 8)}^{\frac{1}{2}}}$

Step 7

Factor $2$ out of $8$ .

$\frac{2 \cdot 4}{2 x^{\frac{1}{2}} {(5 x + 8)}^{\frac{1}{2}}}$

Step 8

Cancel the common factors.

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Step 8.1

Factor $2$ out of $2 x^{\frac{1}{2}} {(5 x + 8)}^{\frac{1}{2}}$ .

$\frac{2 \cdot 4}{2 (x^{\frac{1}{2}} {(5 x + 8)}^{\frac{1}{2}})}$

Step 8.2

Cancel the common factor.

$\frac{2 \cdot 4}{2 (x^{\frac{1}{2}} {(5 x + 8)}^{\frac{1}{2}})}$

Step 8.3

Rewrite the expression.

$\frac{4}{x^{\frac{1}{2}} {(5 x + 8)}^{\frac{1}{2}}}$