Basic Math Examples

$\frac{15 a^{3}}{a^{3} + 3 a^{2} - 9 a - 27} \cdot \frac{2 a^{2} + 13 a + 21}{10 a^{2} + 35}$

Step 1

Simplify the denominator.

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Step 1.1

Factor out the greatest common factor from each group.

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Step 1.1.1

Group the first two terms and the last two terms.

$\frac{15 a^{3}}{(a^{3} + 3 a^{2}) - 9 a - 27} \cdot \frac{2 a^{2} + 13 a + 21}{10 a^{2} + 35}$

Step 1.1.2

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

$\frac{15 a^{3}}{a^{2} (a + 3) - 9 (a + 3)} \cdot \frac{2 a^{2} + 13 a + 21}{10 a^{2} + 35}$

Step 1.2

Factor the polynomial by factoring out the greatest common factor, $a + 3$ .

$\frac{15 a^{3}}{(a + 3) (a^{2} - 9)} \cdot \frac{2 a^{2} + 13 a + 21}{10 a^{2} + 35}$

Step 1.3

Rewrite $9$ as $3^{2}$ .

$\frac{15 a^{3}}{(a + 3) (a^{2} - 3^{2})} \cdot \frac{2 a^{2} + 13 a + 21}{10 a^{2} + 35}$

Step 1.4

Since both terms are perfect squares, factor using the difference of squares formula, $a^{2} - b^{2} = (a + b) (a - b)$ where $a = a$ and $b = 3$ .

$\frac{15 a^{3}}{(a + 3) (a + 3) (a - 3)} \cdot \frac{2 a^{2} + 13 a + 21}{10 a^{2} + 35}$

Step 1.5

Combine exponents.

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Step 1.5.1

Raise $a + 3$ to the power of $1$ .

$\frac{15 a^{3}}{{(a + 3)}^{1} (a + 3) (a - 3)} \cdot \frac{2 a^{2} + 13 a + 21}{10 a^{2} + 35}$

Step 1.5.2

Raise $a + 3$ to the power of $1$ .

$\frac{15 a^{3}}{{(a + 3)}^{1} {(a + 3)}^{1} (a - 3)} \cdot \frac{2 a^{2} + 13 a + 21}{10 a^{2} + 35}$

Step 1.5.3

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

$\frac{15 a^{3}}{{(a + 3)}^{1 + 1} (a - 3)} \cdot \frac{2 a^{2} + 13 a + 21}{10 a^{2} + 35}$

Step 1.5.4

Add $1$ and $1$ .

$\frac{15 a^{3}}{{(a + 3)}^{2} (a - 3)} \cdot \frac{2 a^{2} + 13 a + 21}{10 a^{2} + 35}$

Step 2

Factor by grouping.

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Step 2.1

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 $a \cdot c = 2 \cdot 21 = 42$ and whose sum is $b = 13$ .

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Step 2.1.1

Factor $13$ out of $13 a$ .

$\frac{15 a^{3}}{{(a + 3)}^{2} (a - 3)} \cdot \frac{2 a^{2} + 13 (a) + 21}{10 a^{2} + 35}$

Step 2.1.2

Rewrite $13$ as $6$ plus $7$

$\frac{15 a^{3}}{{(a + 3)}^{2} (a - 3)} \cdot \frac{2 a^{2} + (6 + 7) a + 21}{10 a^{2} + 35}$

Step 2.1.3

Apply the distributive property.

$\frac{15 a^{3}}{{(a + 3)}^{2} (a - 3)} \cdot \frac{2 a^{2} + 6 a + 7 a + 21}{10 a^{2} + 35}$

Step 2.2

Factor out the greatest common factor from each group.

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Step 2.2.1

Group the first two terms and the last two terms.

$\frac{15 a^{3}}{{(a + 3)}^{2} (a - 3)} \cdot \frac{(2 a^{2} + 6 a) + 7 a + 21}{10 a^{2} + 35}$

Step 2.2.2

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

$\frac{15 a^{3}}{{(a + 3)}^{2} (a - 3)} \cdot \frac{2 a (a + 3) + 7 (a + 3)}{10 a^{2} + 35}$

Step 2.3

Factor the polynomial by factoring out the greatest common factor, $a + 3$ .

$\frac{15 a^{3}}{{(a + 3)}^{2} (a - 3)} \cdot \frac{(a + 3) (2 a + 7)}{10 a^{2} + 35}$

Step 3

Factor $5$ out of $10 a^{2} + 35$ .

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Step 3.1

Factor $5$ out of $10 a^{2}$ .

$\frac{15 a^{3}}{{(a + 3)}^{2} (a - 3)} \cdot \frac{(a + 3) (2 a + 7)}{5 (2 a^{2}) + 35}$

Step 3.2

Factor $5$ out of $35$ .

$\frac{15 a^{3}}{{(a + 3)}^{2} (a - 3)} \cdot \frac{(a + 3) (2 a + 7)}{5 (2 a^{2}) + 5 (7)}$

Step 3.3

Factor $5$ out of $5 (2 a^{2}) + 5 (7)$ .

$\frac{15 a^{3}}{{(a + 3)}^{2} (a - 3)} \cdot \frac{(a + 3) (2 a + 7)}{5 (2 a^{2} + 7)}$

Step 4

Combine.

$\frac{15 a^{3} ((a + 3) (2 a + 7))}{{(a + 3)}^{2} (a - 3) (5 (2 a^{2} + 7))}$

Step 5

Cancel the common factor of $15$ and $5$ .

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Step 5.1

Factor $5$ out of $15 a^{3} ((a + 3) (2 a + 7))$ .

$\frac{5 (3 a^{3} ((a + 3) (2 a + 7)))}{{(a + 3)}^{2} (a - 3) (5 (2 a^{2} + 7))}$

Step 5.2

Cancel the common factors.

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Step 5.2.1

Factor $5$ out of ${(a + 3)}^{2} (a - 3) (5 (2 a^{2} + 7))$ .

$\frac{5 (3 a^{3} ((a + 3) (2 a + 7)))}{5 ({(a + 3)}^{2} (a - 3) (2 a^{2} + 7))}$

Step 5.2.2

Cancel the common factor.

$\frac{5 (3 a^{3} ((a + 3) (2 a + 7)))}{5 ({(a + 3)}^{2} (a - 3) (2 a^{2} + 7))}$

Step 5.2.3

Rewrite the expression.

$\frac{3 a^{3} ((a + 3) (2 a + 7))}{{(a + 3)}^{2} (a - 3) (2 a^{2} + 7)}$

Step 6

Cancel the common factor of $a + 3$ and ${(a + 3)}^{2}$ .

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Step 6.1

Factor $a + 3$ out of $3 a^{3} ((a + 3) (2 a + 7))$ .

$\frac{(a + 3) (3 a^{3} (2 a + 7))}{{(a + 3)}^{2} (a - 3) (2 a^{2} + 7)}$

Step 6.2

Cancel the common factors.

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Step 6.2.1

Factor $a + 3$ out of ${(a + 3)}^{2} (a - 3) (2 a^{2} + 7)$ .

$\frac{(a + 3) (3 a^{3} (2 a + 7))}{(a + 3) (((a + 3) (a - 3)) (2 a^{2} + 7))}$

Step 6.2.2

Cancel the common factor.

$\frac{(a + 3) (3 a^{3} (2 a + 7))}{(a + 3) (((a + 3) (a - 3)) (2 a^{2} + 7))}$

Step 6.2.3

Rewrite the expression.

$\frac{3 a^{3} (2 a + 7)}{((a + 3) (a - 3)) (2 a^{2} + 7)}$

$\frac{3 a^{3} (2 a + 7)}{(a + 3) (a - 3) (2 a^{2} + 7)}$