Pre-Algebra Examples

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

Step 1

Simplify the numerator.

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Step 1.1

Apply the distributive property.

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

Step 1.2

Multiply $- 1$ by $- 2$ .

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

Step 1.3

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

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

Step 1.4

Multiply $- x + 2$ by $\frac{1}{{(4 x - 5)}^{\frac{4}{5}}}$ .

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

Step 1.5

To write $5 {(4 x - 5)}^{\frac{1}{5}}$ as a fraction with a common denominator, multiply by $\frac{{(4 x - 5)}^{\frac{4}{5}}}{{(4 x - 5)}^{\frac{4}{5}}}$ .

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

Step 1.6

Combine the numerators over the common denominator.

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

Step 1.7

Reorder terms.

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

Step 1.8

Rewrite $\frac{5 {(4 x - 5)}^{\frac{4}{5}} {(4 x - 5)}^{\frac{1}{5}} - x + 2}{{(4 x - 5)}^{\frac{4}{5}}}$ in a factored form.

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Step 1.8.1

Multiply ${(4 x - 5)}^{\frac{4}{5}}$ by ${(4 x - 5)}^{\frac{1}{5}}$ by adding the exponents.

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Step 1.8.1.1

Move ${(4 x - 5)}^{\frac{1}{5}}$ .

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

Step 1.8.1.2

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

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

Step 1.8.1.3

Combine the numerators over the common denominator.

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

Step 1.8.1.4

Add $1$ and $4$ .

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

Step 1.8.1.5

Divide $5$ by $5$ .

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

Step 1.8.2

Simplify $5 {(4 x - 5)}^{1}$ .

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

Step 1.8.3

Apply the distributive property.

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

Step 1.8.4

Multiply $4$ by $5$ .

$\frac{\frac{20 x + 5 \cdot - 5 - x + 2}{{(4 x - 5)}^{\frac{4}{5}}}}{{(4 x - 5)}^{\frac{4}{5}}}$

Step 1.8.5

Multiply $5$ by $- 5$ .

$\frac{\frac{20 x - 25 - x + 2}{{(4 x - 5)}^{\frac{4}{5}}}}{{(4 x - 5)}^{\frac{4}{5}}}$

Step 1.8.6

Subtract $x$ from $20 x$ .

$\frac{\frac{19 x - 25 + 2}{{(4 x - 5)}^{\frac{4}{5}}}}{{(4 x - 5)}^{\frac{4}{5}}}$

Step 1.8.7

Add $- 25$ and $2$ .

$\frac{\frac{19 x - 23}{{(4 x - 5)}^{\frac{4}{5}}}}{{(4 x - 5)}^{\frac{4}{5}}}$

Step 2

Multiply the numerator by the reciprocal of the denominator.

$\frac{19 x - 23}{{(4 x - 5)}^{\frac{4}{5}}} \cdot \frac{1}{{(4 x - 5)}^{\frac{4}{5}}}$

Step 3

Multiply $\frac{19 x - 23}{{(4 x - 5)}^{\frac{4}{5}}} \cdot \frac{1}{{(4 x - 5)}^{\frac{4}{5}}}$ .

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Step 3.1

Multiply $\frac{19 x - 23}{{(4 x - 5)}^{\frac{4}{5}}}$ by $\frac{1}{{(4 x - 5)}^{\frac{4}{5}}}$ .

$\frac{19 x - 23}{{(4 x - 5)}^{\frac{4}{5}} {(4 x - 5)}^{\frac{4}{5}}}$

Step 3.2

Multiply ${(4 x - 5)}^{\frac{4}{5}}$ by ${(4 x - 5)}^{\frac{4}{5}}$ by adding the exponents.

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Step 3.2.1

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

$\frac{19 x - 23}{{(4 x - 5)}^{\frac{4}{5} + \frac{4}{5}}}$

Step 3.2.2

Combine the numerators over the common denominator.

$\frac{19 x - 23}{{(4 x - 5)}^{\frac{4 + 4}{5}}}$

Step 3.2.3

Add $4$ and $4$ .

$\frac{19 x - 23}{{(4 x - 5)}^{\frac{8}{5}}}$

Step 4

Split the fraction $\frac{19 x - 23}{{(4 x - 5)}^{\frac{8}{5}}}$ into two fractions.

$\frac{19 x}{{(4 x - 5)}^{\frac{8}{5}}} + \frac{- 23}{{(4 x - 5)}^{\frac{8}{5}}}$

Step 5

Move the negative in front of the fraction.

$\frac{19 x}{{(4 x - 5)}^{\frac{8}{5}}} - \frac{23}{{(4 x - 5)}^{\frac{8}{5}}}$