Basic Math Examples

$(\frac{2 m n}{{(m - n)}^{2}}) (\frac{m}{n} - \frac{n}{m}) (\frac{m^{2} + m n + n^{2}}{m + n})$

Step 1

Multiply $\frac{2 m n}{{(m - n)}^{2}}$ by $\frac{m}{n} - \frac{n}{m}$ .

$\frac{2 m n (\frac{m}{n} - \frac{n}{m})}{{(m - n)}^{2}} \cdot \frac{m^{2} + m n + n^{2}}{m + n}$

Step 2

Simplify the numerator.

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Step 2.1

To write $\frac{m}{n}$ as a fraction with a common denominator, multiply by $\frac{m}{m}$ .

$\frac{2 m n (\frac{m}{n} \cdot \frac{m}{m} - \frac{n}{m})}{{(m - n)}^{2}} \cdot \frac{m^{2} + m n + n^{2}}{m + n}$

Step 2.2

To write $- \frac{n}{m}$ as a fraction with a common denominator, multiply by $\frac{n}{n}$ .

$\frac{2 m n (\frac{m}{n} \cdot \frac{m}{m} - \frac{n}{m} \cdot \frac{n}{n})}{{(m - n)}^{2}} \cdot \frac{m^{2} + m n + n^{2}}{m + n}$

Step 2.3

Write each expression with a common denominator of $n m$ , by multiplying each by an appropriate factor of $1$ .

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Step 2.3.1

Multiply $\frac{m}{n}$ by $\frac{m}{m}$ .

$\frac{2 m n (\frac{m \cdot m}{n m} - \frac{n}{m} \cdot \frac{n}{n})}{{(m - n)}^{2}} \cdot \frac{m^{2} + m n + n^{2}}{m + n}$

Step 2.3.2

Multiply $\frac{n}{m}$ by $\frac{n}{n}$ .

$\frac{2 m n (\frac{m \cdot m}{n m} - \frac{n \cdot n}{m n})}{{(m - n)}^{2}} \cdot \frac{m^{2} + m n + n^{2}}{m + n}$

Step 2.3.3

Reorder the factors of $n m$ .

$\frac{2 m n (\frac{m \cdot m}{m n} - \frac{n \cdot n}{m n})}{{(m - n)}^{2}} \cdot \frac{m^{2} + m n + n^{2}}{m + n}$

Step 2.4

Combine the numerators over the common denominator.

$\frac{2 m n \frac{m \cdot m - n \cdot n}{m n}}{{(m - n)}^{2}} \cdot \frac{m^{2} + m n + n^{2}}{m + n}$

Step 2.5

Simplify the numerator.

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Step 2.5.1

Raise $m$ to the power of $1$ .

$\frac{2 m n \frac{m^{1} m - n \cdot n}{m n}}{{(m - n)}^{2}} \cdot \frac{m^{2} + m n + n^{2}}{m + n}$

Step 2.5.2

Raise $m$ to the power of $1$ .

$\frac{2 m n \frac{m^{1} m^{1} - n \cdot n}{m n}}{{(m - n)}^{2}} \cdot \frac{m^{2} + m n + n^{2}}{m + n}$

Step 2.5.3

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

$\frac{2 m n \frac{m^{1 + 1} - n \cdot n}{m n}}{{(m - n)}^{2}} \cdot \frac{m^{2} + m n + n^{2}}{m + n}$

Step 2.5.4

Add $1$ and $1$ .

$\frac{2 m n \frac{m^{2} - n \cdot n}{m n}}{{(m - n)}^{2}} \cdot \frac{m^{2} + m n + n^{2}}{m + n}$

Step 2.5.5

Rewrite $n \cdot n$ as $n^{2}$ .

$\frac{2 m n \frac{m^{2} - n^{2}}{m n}}{{(m - n)}^{2}} \cdot \frac{m^{2} + m n + n^{2}}{m + n}$

Step 2.5.6

Since both terms are perfect squares, factor using the difference of squares formula, $a^{2} - b^{2} = (a + b) (a - b)$ where $a = m$ and $b = n$ .

$\frac{2 m n \frac{(m + n) (m - n)}{m n}}{{(m - n)}^{2}} \cdot \frac{m^{2} + m n + n^{2}}{m + n}$

Step 2.6

Combine exponents.

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Step 2.6.1

Combine $2$ and $\frac{(m + n) (m - n)}{m n}$ .

$\frac{m n \frac{2 ((m + n) (m - n))}{m n}}{{(m - n)}^{2}} \cdot \frac{m^{2} + m n + n^{2}}{m + n}$

Step 2.6.2

Combine $m$ and $\frac{2 ((m + n) (m - n))}{m n}$ .

$\frac{n \frac{m (2 ((m + n) (m - n)))}{m n}}{{(m - n)}^{2}} \cdot \frac{m^{2} + m n + n^{2}}{m + n}$

Step 2.6.3

Combine $n$ and $\frac{m (2 ((m + n) (m - n)))}{m n}$ .

$\frac{\frac{n (m (2 ((m + n) (m - n))))}{m n}}{{(m - n)}^{2}} \cdot \frac{m^{2} + m n + n^{2}}{m + n}$

Step 2.7

Remove unnecessary parentheses.

$\frac{\frac{n m \cdot 2 (m + n) (m - n)}{m n}}{{(m - n)}^{2}} \cdot \frac{m^{2} + m n + n^{2}}{m + n}$

Step 2.8

Reduce the expression $\frac{n m \cdot 2 (m + n) (m - n)}{m n}$ by cancelling the common factors.

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Step 2.8.1

Cancel the common factor.

$\frac{\frac{n m \cdot 2 (m + n) (m - n)}{m n}}{{(m - n)}^{2}} \cdot \frac{m^{2} + m n + n^{2}}{m + n}$

Step 2.8.2

Rewrite the expression.

$\frac{\frac{(m \cdot 2 (m + n)) (m - n)}{m}}{{(m - n)}^{2}} \cdot \frac{m^{2} + m n + n^{2}}{m + n}$

Step 2.9

Cancel the common factor of $m$ .

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Step 2.9.1

Cancel the common factor.

$\frac{\frac{m \cdot 2 (m + n) (m - n)}{m}}{{(m - n)}^{2}} \cdot \frac{m^{2} + m n + n^{2}}{m + n}$

Step 2.9.2

Divide $(2 (m + n)) (m - n)$ by $1$ .

$\frac{(2 (m + n)) (m - n)}{{(m - n)}^{2}} \cdot \frac{m^{2} + m n + n^{2}}{m + n}$

Step 2.10

Apply the distributive property.

$\frac{(2 m + 2 n) (m - n)}{{(m - n)}^{2}} \cdot \frac{m^{2} + m n + n^{2}}{m + n}$

Step 2.11

Expand $(2 m + 2 n) (m - n)$ using the FOIL Method.

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Step 2.11.1

Apply the distributive property.

$\frac{2 m (m - n) + 2 n (m - n)}{{(m - n)}^{2}} \cdot \frac{m^{2} + m n + n^{2}}{m + n}$

Step 2.11.2

Apply the distributive property.

$\frac{2 m \cdot m + 2 m (- n) + 2 n (m - n)}{{(m - n)}^{2}} \cdot \frac{m^{2} + m n + n^{2}}{m + n}$

Step 2.11.3

Apply the distributive property.

$\frac{2 m \cdot m + 2 m (- n) + 2 n m + 2 n (- n)}{{(m - n)}^{2}} \cdot \frac{m^{2} + m n + n^{2}}{m + n}$

Step 2.12

Simplify and combine like terms.

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Step 2.12.1

Simplify each term.

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Step 2.12.1.1

Multiply $m$ by $m$ by adding the exponents.

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Step 2.12.1.1.1

Move $m$ .

$\frac{2 (m \cdot m) + 2 m (- n) + 2 n m + 2 n (- n)}{{(m - n)}^{2}} \cdot \frac{m^{2} + m n + n^{2}}{m + n}$

Step 2.12.1.1.2

Multiply $m$ by $m$ .

$\frac{2 m^{2} + 2 m (- n) + 2 n m + 2 n (- n)}{{(m - n)}^{2}} \cdot \frac{m^{2} + m n + n^{2}}{m + n}$

Step 2.12.1.2

Rewrite using the commutative property of multiplication.

$\frac{2 m^{2} + 2 \cdot - 1 m n + 2 n m + 2 n (- n)}{{(m - n)}^{2}} \cdot \frac{m^{2} + m n + n^{2}}{m + n}$

Step 2.12.1.3

Multiply $2$ by $- 1$ .

$\frac{2 m^{2} - 2 m n + 2 n m + 2 n (- n)}{{(m - n)}^{2}} \cdot \frac{m^{2} + m n + n^{2}}{m + n}$

Step 2.12.1.4

Rewrite using the commutative property of multiplication.

$\frac{2 m^{2} - 2 m n + 2 n m + 2 \cdot - 1 n \cdot n}{{(m - n)}^{2}} \cdot \frac{m^{2} + m n + n^{2}}{m + n}$

Step 2.12.1.5

Multiply $n$ by $n$ by adding the exponents.

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Step 2.12.1.5.1

Move $n$ .

$\frac{2 m^{2} - 2 m n + 2 n m + 2 \cdot - 1 (n \cdot n)}{{(m - n)}^{2}} \cdot \frac{m^{2} + m n + n^{2}}{m + n}$

Step 2.12.1.5.2

Multiply $n$ by $n$ .

$\frac{2 m^{2} - 2 m n + 2 n m + 2 \cdot - 1 n^{2}}{{(m - n)}^{2}} \cdot \frac{m^{2} + m n + n^{2}}{m + n}$

Step 2.12.1.6

Multiply $2$ by $- 1$ .

$\frac{2 m^{2} - 2 m n + 2 n m - 2 n^{2}}{{(m - n)}^{2}} \cdot \frac{m^{2} + m n + n^{2}}{m + n}$

Step 2.12.2

Add $- 2 m n$ and $2 n m$ .

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Step 2.12.2.1

Move $n$ .

$\frac{2 m^{2} - 2 m n + 2 m n - 2 n^{2}}{{(m - n)}^{2}} \cdot \frac{m^{2} + m n + n^{2}}{m + n}$

Step 2.12.2.2

Add $- 2 m n$ and $2 m n$ .

$\frac{2 m^{2} + 0 - 2 n^{2}}{{(m - n)}^{2}} \cdot \frac{m^{2} + m n + n^{2}}{m + n}$

Step 2.12.3

Add $2 m^{2}$ and $0$ .

$\frac{2 m^{2} - 2 n^{2}}{{(m - n)}^{2}} \cdot \frac{m^{2} + m n + n^{2}}{m + n}$

Step 2.13

Factor $2$ out of $2 m^{2} - 2 n^{2}$ .

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Step 2.13.1

Factor $2$ out of $2 m^{2}$ .

$\frac{2 (m^{2}) - 2 n^{2}}{{(m - n)}^{2}} \cdot \frac{m^{2} + m n + n^{2}}{m + n}$

Step 2.13.2

Factor $2$ out of $- 2 n^{2}$ .

$\frac{2 (m^{2}) + 2 (- n^{2})}{{(m - n)}^{2}} \cdot \frac{m^{2} + m n + n^{2}}{m + n}$

Step 2.13.3

Factor $2$ out of $2 (m^{2}) + 2 (- n^{2})$ .

$\frac{2 (m^{2} - n^{2})}{{(m - n)}^{2}} \cdot \frac{m^{2} + m n + n^{2}}{m + n}$

Step 2.14

Since both terms are perfect squares, factor using the difference of squares formula, $a^{2} - b^{2} = (a + b) (a - b)$ where $a = m$ and $b = n$ .

$\frac{2 (m + n) (m - n)}{{(m - n)}^{2}} \cdot \frac{m^{2} + m n + n^{2}}{m + n}$

Step 3

Simplify terms.

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Step 3.1

Cancel the common factor of $m + n$ .

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Step 3.1.1

Factor $m + n$ out of $2 (m + n) (m - n)$ .

$\frac{(m + n) (2 (m - n))}{{(m - n)}^{2}} \cdot \frac{m^{2} + m n + n^{2}}{m + n}$

Step 3.1.2

Cancel the common factor.

$\frac{(m + n) (2 (m - n))}{{(m - n)}^{2}} \cdot \frac{m^{2} + m n + n^{2}}{m + n}$

Step 3.1.3

Rewrite the expression.

$\frac{2 (m - n)}{{(m - n)}^{2}} (m^{2} + m n + n^{2})$

Step 3.2

Cancel the common factor of $m - n$ and ${(m - n)}^{2}$ .

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Step 3.2.1

Factor $m - n$ out of $2 (m - n)$ .

$\frac{(m - n) \cdot 2}{{(m - n)}^{2}} (m^{2} + m n + n^{2})$

Step 3.2.2

Cancel the common factors.

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Step 3.2.2.1

Factor $m - n$ out of ${(m - n)}^{2}$ .

$\frac{(m - n) \cdot 2}{(m - n) (m - n)} (m^{2} + m n + n^{2})$

Step 3.2.2.2

Cancel the common factor.

$\frac{(m - n) \cdot 2}{(m - n) (m - n)} (m^{2} + m n + n^{2})$

Step 3.2.2.3

Rewrite the expression.

$\frac{2}{m - n} (m^{2} + m n + n^{2})$

Step 3.3

Multiply $\frac{2}{m - n}$ by $m^{2} + m n + n^{2}$ .

$\frac{2 (m^{2} + m n + n^{2})}{m - n}$