Basic Math Examples

$\frac{a (3 a + b) (2 a - 9 b) a}{b \cdot b \cdot (b (a + 5 b))} \cdot \frac{5 a b - 20 b^{2}}{a^{2} - 9 a b + 20 b^{2}}$

Step 1

Simplify the numerator.

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Step 1.1

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

$\frac{a^{1} a (3 a + b) (2 a - 9 b)}{b \cdot b \cdot (b (a + 5 b))} \cdot \frac{5 a b - 20 b^{2}}{a^{2} - 9 a b + 20 b^{2}}$

Step 1.2

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

$\frac{a^{1} a^{1} (3 a + b) (2 a - 9 b)}{b \cdot b \cdot (b (a + 5 b))} \cdot \frac{5 a b - 20 b^{2}}{a^{2} - 9 a b + 20 b^{2}}$

Step 1.3

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

$\frac{a^{1 + 1} (3 a + b) (2 a - 9 b)}{b \cdot b \cdot (b (a + 5 b))} \cdot \frac{5 a b - 20 b^{2}}{a^{2} - 9 a b + 20 b^{2}}$

Step 1.4

Add $1$ and $1$ .

$\frac{a^{2} (3 a + b) (2 a - 9 b)}{b \cdot b \cdot (b (a + 5 b))} \cdot \frac{5 a b - 20 b^{2}}{a^{2} - 9 a b + 20 b^{2}}$

Step 2

Simplify the denominator.

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Step 2.1

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

$\frac{a^{2} (3 a + b) (2 a - 9 b)}{b^{1} \cdot b (b (a + 5 b))} \cdot \frac{5 a b - 20 b^{2}}{a^{2} - 9 a b + 20 b^{2}}$

Step 2.2

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

$\frac{a^{2} (3 a + b) (2 a - 9 b)}{b^{1} \cdot b^{1} (b (a + 5 b))} \cdot \frac{5 a b - 20 b^{2}}{a^{2} - 9 a b + 20 b^{2}}$

Step 2.3

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

$\frac{a^{2} (3 a + b) (2 a - 9 b)}{b^{1 + 1} (b (a + 5 b))} \cdot \frac{5 a b - 20 b^{2}}{a^{2} - 9 a b + 20 b^{2}}$

Step 2.4

Add $1$ and $1$ .

$\frac{a^{2} (3 a + b) (2 a - 9 b)}{b^{2} (b (a + 5 b))} \cdot \frac{5 a b - 20 b^{2}}{a^{2} - 9 a b + 20 b^{2}}$

Step 2.5

Multiply $b^{2}$ by $b$ by adding the exponents.

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Step 2.5.1

Move $b$ .

$\frac{a^{2} (3 a + b) (2 a - 9 b)}{b \cdot b^{2} (a + 5 b)} \cdot \frac{5 a b - 20 b^{2}}{a^{2} - 9 a b + 20 b^{2}}$

Step 2.5.2

Multiply $b$ by $b^{2}$ .

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Step 2.5.2.1

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

$\frac{a^{2} (3 a + b) (2 a - 9 b)}{b^{1} b^{2} (a + 5 b)} \cdot \frac{5 a b - 20 b^{2}}{a^{2} - 9 a b + 20 b^{2}}$

Step 2.5.2.2

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

$\frac{a^{2} (3 a + b) (2 a - 9 b)}{b^{1 + 2} (a + 5 b)} \cdot \frac{5 a b - 20 b^{2}}{a^{2} - 9 a b + 20 b^{2}}$

Step 2.5.3

Add $1$ and $2$ .

$\frac{a^{2} (3 a + b) (2 a - 9 b)}{b^{3} (a + 5 b)} \cdot \frac{5 a b - 20 b^{2}}{a^{2} - 9 a b + 20 b^{2}}$

Step 3

Factor $5 b$ out of $5 a b - 20 b^{2}$ .

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Step 3.1

Factor $5 b$ out of $5 a b$ .

$\frac{a^{2} (3 a + b) (2 a - 9 b)}{b^{3} (a + 5 b)} \cdot \frac{5 b (a) - 20 b^{2}}{a^{2} - 9 a b + 20 b^{2}}$

Step 3.2

Factor $5 b$ out of $- 20 b^{2}$ .

$\frac{a^{2} (3 a + b) (2 a - 9 b)}{b^{3} (a + 5 b)} \cdot \frac{5 b (a) + 5 b (- 4 b)}{a^{2} - 9 a b + 20 b^{2}}$

Step 3.3

Factor $5 b$ out of $5 b (a) + 5 b (- 4 b)$ .

$\frac{a^{2} (3 a + b) (2 a - 9 b)}{b^{3} (a + 5 b)} \cdot \frac{5 b (a - 4 b)}{a^{2} - 9 a b + 20 b^{2}}$

Step 4

Factor by grouping.

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Step 4.1

For a polynomial of the form $a x^{2} + b x + c$ , rewrite the middle term as a sum of two terms whose product is $a \cdot c = 1 \cdot 20 = 20$ and whose sum is $b = - 9$ .

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Step 4.1.1

Reorder terms.

$\frac{a^{2} (3 a + b) (2 a - 9 b)}{b^{3} (a + 5 b)} \cdot \frac{5 b (a - 4 b)}{a^{2} + 20 b^{2} - 9 a b}$

Step 4.1.2

Reorder $20 b^{2}$ and $- 9 a b$ .

$\frac{a^{2} (3 a + b) (2 a - 9 b)}{b^{3} (a + 5 b)} \cdot \frac{5 b (a - 4 b)}{a^{2} - 9 a b + 20 b^{2}}$

Step 4.1.3

Factor $- 9$ out of $- 9 a b$ .

$\frac{a^{2} (3 a + b) (2 a - 9 b)}{b^{3} (a + 5 b)} \cdot \frac{5 b (a - 4 b)}{a^{2} - 9 (a b) + 20 b^{2}}$

Step 4.1.4

Rewrite $- 9$ as $- 4$ plus $- 5$

$\frac{a^{2} (3 a + b) (2 a - 9 b)}{b^{3} (a + 5 b)} \cdot \frac{5 b (a - 4 b)}{a^{2} + (- 4 - 5) (a b) + 20 b^{2}}$

Step 4.1.5

Apply the distributive property.

$\frac{a^{2} (3 a + b) (2 a - 9 b)}{b^{3} (a + 5 b)} \cdot \frac{5 b (a - 4 b)}{a^{2} - 4 (a b) - 5 (a b) + 20 b^{2}}$

Step 4.1.6

Move parentheses.

$\frac{a^{2} (3 a + b) (2 a - 9 b)}{b^{3} (a + 5 b)} \cdot \frac{5 b (a - 4 b)}{a^{2} - 4 a b - 5 a b + 20 b^{2}}$

Step 4.2

Factor out the greatest common factor from each group.

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Step 4.2.1

Group the first two terms and the last two terms.

$\frac{a^{2} (3 a + b) (2 a - 9 b)}{b^{3} (a + 5 b)} \cdot \frac{5 b (a - 4 b)}{(a^{2} - 4 a b) - 5 a b + 20 b^{2}}$

Step 4.2.2

Factor out the greatest common factor (GCF) from each group.

$\frac{a^{2} (3 a + b) (2 a - 9 b)}{b^{3} (a + 5 b)} \cdot \frac{5 b (a - 4 b)}{a (a - 4 b) - 5 b (a - 4 b)}$

Step 4.3

Factor the polynomial by factoring out the greatest common factor, $a - 4 b$ .

$\frac{a^{2} (3 a + b) (2 a - 9 b)}{b^{3} (a + 5 b)} \cdot \frac{5 b (a - 4 b)}{(a - 4 b) (a - 5 b)}$

Step 5

Combine.

$\frac{a^{2} (3 a + b) (2 a - 9 b) (5 b (a - 4 b))}{b^{3} (a + 5 b) ((a - 4 b) (a - 5 b))}$

Step 6

Cancel the common factor of $b$ and $b^{3}$ .

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Step 6.1

Factor $b$ out of $a^{2} (3 a + b) (2 a - 9 b) (5 b (a - 4 b))$ .

$\frac{b (a^{2} (3 a + b) (2 a - 9 b) (5 (a - 4 b)))}{b^{3} (a + 5 b) ((a - 4 b) (a - 5 b))}$

Step 6.2

Cancel the common factors.

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Step 6.2.1

Factor $b$ out of $b^{3} (a + 5 b) ((a - 4 b) (a - 5 b))$ .

$\frac{b (a^{2} (3 a + b) (2 a - 9 b) (5 (a - 4 b)))}{b ((b^{2} (a + 5 b)) ((a - 4 b) (a - 5 b)))}$

Step 6.2.2

Cancel the common factor.

$\frac{b (a^{2} (3 a + b) (2 a - 9 b) (5 (a - 4 b)))}{b ((b^{2} (a + 5 b)) ((a - 4 b) (a - 5 b)))}$

Step 6.2.3

Rewrite the expression.

$\frac{a^{2} (3 a + b) (2 a - 9 b) (5 (a - 4 b))}{(b^{2} (a + 5 b)) ((a - 4 b) (a - 5 b))}$

Step 7

Cancel the common factor of $a - 4 b$ .

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Step 7.1

Cancel the common factor.

$\frac{a^{2} (3 a + b) (2 a - 9 b) (5 (a - 4 b))}{b^{2} (a + 5 b) ((a - 4 b) (a - 5 b))}$

Step 7.2

Rewrite the expression.

$\frac{a^{2} (3 a + b) (2 a - 9 b) \cdot (5)}{(b^{2} (a + 5 b)) (a - 5 b)}$

Step 8

Move $5$ to the left of $a^{2} (3 a + b) (2 a - 9 b)$ .

$\frac{5 a^{2} (3 a + b) (2 a - 9 b)}{b^{2} (a + 5 b) (a - 5 b)}$