Algebra Examples

$\frac{x^{2} + 2 x - 35}{- x - 5} \cdot \frac{4 x^{3} + 24 x^{2} + 20 x}{x^{3} + 12 x^{2} + 35 x} \cdot \frac{x^{2} + 13 x + 40}{x^{2} + 9 x + 8}$

Step 1

Factor $x^{2} + 13 x + 40$ using the AC method.

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Step 1.1

Consider the form $x^{2} + b x + c$ . Find a pair of integers whose product is $c$ and whose sum is $b$ . In this case, whose product is $40$ and whose sum is $13$ .

$5, 8$

Step 1.2

Write the factored form using these integers.

$\frac{x^{2} + 2 x - 35}{- x - 5} \cdot \frac{4 x^{3} + 24 x^{2} + 20 x}{x^{3} + 12 x^{2} + 35 x} \cdot \frac{(x + 5) (x + 8)}{x^{2} + 9 x + 8}$

Step 2

Factor $x^{2} + 9 x + 8$ using the AC method.

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Step 2.1

Consider the form $x^{2} + b x + c$ . Find a pair of integers whose product is $c$ and whose sum is $b$ . In this case, whose product is $8$ and whose sum is $9$ .

$1, 8$

Step 2.2

Write the factored form using these integers.

$\frac{x^{2} + 2 x - 35}{- x - 5} \cdot \frac{4 x^{3} + 24 x^{2} + 20 x}{x^{3} + 12 x^{2} + 35 x} \cdot \frac{(x + 5) (x + 8)}{(x + 1) (x + 8)}$

Step 3

Factor $x^{2} + 2 x - 35$ using the AC method.

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Step 3.1

Consider the form $x^{2} + b x + c$ . Find a pair of integers whose product is $c$ and whose sum is $b$ . In this case, whose product is $- 35$ and whose sum is $2$ .

$- 5, 7$

Step 3.2

Write the factored form using these integers.

$\frac{(x - 5) (x + 7)}{- x - 5} \cdot \frac{4 x^{3} + 24 x^{2} + 20 x}{x^{3} + 12 x^{2} + 35 x} \cdot \frac{(x + 5) (x + 8)}{(x + 1) (x + 8)}$

Step 4

Simplify the numerator.

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Step 4.1

Factor $4 x$ out of $4 x^{3} + 24 x^{2} + 20 x$ .

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Step 4.1.1

Factor $4 x$ out of $4 x^{3}$ .

$\frac{(x - 5) (x + 7)}{- x - 5} \cdot \frac{4 x (x^{2}) + 24 x^{2} + 20 x}{x^{3} + 12 x^{2} + 35 x} \cdot \frac{(x + 5) (x + 8)}{(x + 1) (x + 8)}$

Step 4.1.2

Factor $4 x$ out of $24 x^{2}$ .

$\frac{(x - 5) (x + 7)}{- x - 5} \cdot \frac{4 x (x^{2}) + 4 x (6 x) + 20 x}{x^{3} + 12 x^{2} + 35 x} \cdot \frac{(x + 5) (x + 8)}{(x + 1) (x + 8)}$

Step 4.1.3

Factor $4 x$ out of $20 x$ .

$\frac{(x - 5) (x + 7)}{- x - 5} \cdot \frac{4 x (x^{2}) + 4 x (6 x) + 4 x (5)}{x^{3} + 12 x^{2} + 35 x} \cdot \frac{(x + 5) (x + 8)}{(x + 1) (x + 8)}$

Step 4.1.4

Factor $4 x$ out of $4 x (x^{2}) + 4 x (6 x)$ .

$\frac{(x - 5) (x + 7)}{- x - 5} \cdot \frac{4 x (x^{2} + 6 x) + 4 x (5)}{x^{3} + 12 x^{2} + 35 x} \cdot \frac{(x + 5) (x + 8)}{(x + 1) (x + 8)}$

Step 4.1.5

Factor $4 x$ out of $4 x (x^{2} + 6 x) + 4 x (5)$ .

$\frac{(x - 5) (x + 7)}{- x - 5} \cdot \frac{4 x (x^{2} + 6 x + 5)}{x^{3} + 12 x^{2} + 35 x} \cdot \frac{(x + 5) (x + 8)}{(x + 1) (x + 8)}$

Step 4.2

Factor $x^{2} + 6 x + 5$ using the AC method.

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Step 4.2.1

Consider the form $x^{2} + b x + c$ . Find a pair of integers whose product is $c$ and whose sum is $b$ . In this case, whose product is $5$ and whose sum is $6$ .

$1, 5$

Step 4.2.2

Write the factored form using these integers.

$\frac{(x - 5) (x + 7)}{- x - 5} \cdot \frac{4 x ((x + 1) (x + 5))}{x^{3} + 12 x^{2} + 35 x} \cdot \frac{(x + 5) (x + 8)}{(x + 1) (x + 8)}$

$\frac{(x - 5) (x + 7)}{- x - 5} \cdot \frac{4 x (x + 1) (x + 5)}{x^{3} + 12 x^{2} + 35 x} \cdot \frac{(x + 5) (x + 8)}{(x + 1) (x + 8)}$

Step 5

Simplify the denominator.

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Step 5.1

Factor $x$ out of $x^{3} + 12 x^{2} + 35 x$ .

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Step 5.1.1

Factor $x$ out of $x^{3}$ .

$\frac{(x - 5) (x + 7)}{- x - 5} \cdot \frac{4 x (x + 1) (x + 5)}{x \cdot x^{2} + 12 x^{2} + 35 x} \cdot \frac{(x + 5) (x + 8)}{(x + 1) (x + 8)}$

Step 5.1.2

Factor $x$ out of $12 x^{2}$ .

$\frac{(x - 5) (x + 7)}{- x - 5} \cdot \frac{4 x (x + 1) (x + 5)}{x \cdot x^{2} + x (12 x) + 35 x} \cdot \frac{(x + 5) (x + 8)}{(x + 1) (x + 8)}$

Step 5.1.3

Factor $x$ out of $35 x$ .

$\frac{(x - 5) (x + 7)}{- x - 5} \cdot \frac{4 x (x + 1) (x + 5)}{x \cdot x^{2} + x (12 x) + x \cdot 35} \cdot \frac{(x + 5) (x + 8)}{(x + 1) (x + 8)}$

Step 5.1.4

Factor $x$ out of $x \cdot x^{2} + x (12 x)$ .

$\frac{(x - 5) (x + 7)}{- x - 5} \cdot \frac{4 x (x + 1) (x + 5)}{x (x^{2} + 12 x) + x \cdot 35} \cdot \frac{(x + 5) (x + 8)}{(x + 1) (x + 8)}$

Step 5.1.5

Factor $x$ out of $x (x^{2} + 12 x) + x \cdot 35$ .

$\frac{(x - 5) (x + 7)}{- x - 5} \cdot \frac{4 x (x + 1) (x + 5)}{x (x^{2} + 12 x + 35)} \cdot \frac{(x + 5) (x + 8)}{(x + 1) (x + 8)}$

Step 5.2

Factor $x^{2} + 12 x + 35$ using the AC method.

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Step 5.2.1

Consider the form $x^{2} + b x + c$ . Find a pair of integers whose product is $c$ and whose sum is $b$ . In this case, whose product is $35$ and whose sum is $12$ .

$5, 7$

Step 5.2.2

Write the factored form using these integers.

$\frac{(x - 5) (x + 7)}{- x - 5} \cdot \frac{4 x (x + 1) (x + 5)}{x ((x + 5) (x + 7))} \cdot \frac{(x + 5) (x + 8)}{(x + 1) (x + 8)}$

$\frac{(x - 5) (x + 7)}{- x - 5} \cdot \frac{4 x (x + 1) (x + 5)}{x (x + 5) (x + 7)} \cdot \frac{(x + 5) (x + 8)}{(x + 1) (x + 8)}$

Step 6

Simplify terms.

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Step 6.1

Cancel the common factor of $x + 7$ .

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Step 6.1.1

Factor $x + 7$ out of $(x - 5) (x + 7)$ .

$\frac{(x + 7) (x - 5)}{- x - 5} \cdot \frac{4 x (x + 1) (x + 5)}{x (x + 5) (x + 7)} \cdot \frac{(x + 5) (x + 8)}{(x + 1) (x + 8)}$

Step 6.1.2

Factor $x + 7$ out of $x (x + 5) (x + 7)$ .

$\frac{(x + 7) (x - 5)}{- x - 5} \cdot \frac{4 x (x + 1) (x + 5)}{(x + 7) (x (x + 5))} \cdot \frac{(x + 5) (x + 8)}{(x + 1) (x + 8)}$

Step 6.1.3

Cancel the common factor.

$\frac{(x + 7) (x - 5)}{- x - 5} \cdot \frac{4 x (x + 1) (x + 5)}{(x + 7) (x (x + 5))} \cdot \frac{(x + 5) (x + 8)}{(x + 1) (x + 8)}$

Step 6.1.4

Rewrite the expression.

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

Step 6.2

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

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

Step 6.3

Factor $- 1$ out of $- x$ .

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

Step 6.4

Rewrite $- 5$ as $- 1 (5)$ .

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

Step 6.5

Factor $- 1$ out of $- (x) - 1 (5)$ .

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

Step 6.6

Rewrite $- (x + 5)$ as $- 1 (x + 5)$ .

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

Step 7

Raise $x + 5$ to the power of $1$ .

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

Step 8

Raise $x + 5$ to the power of $1$ .

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

Step 9

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

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

Step 10

Add $1$ and $1$ .

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

Step 11

Combine.

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

Step 12

Cancel the common factor of $x$ .

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Step 12.1

Cancel the common factor.

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

Step 12.2

Rewrite the expression.

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

Step 13

Cancel the common factor of $x + 1$ .

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Step 13.1

Cancel the common factor.

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

Step 13.2

Rewrite the expression.

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

Step 14

Cancel the common factor of $x + 5$ and ${(x + 5)}^{2}$ .

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Step 14.1

Factor $x + 5$ out of $((x - 5) ((4) (x + 5))) ((x + 5) (x + 8))$ .

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

Step 14.2

Cancel the common factors.

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Step 14.2.1

Factor $x + 5$ out of $- {(x + 5)}^{2} (x + 8)$ .

$\frac{(x + 5) (((x - 5) \cdot (4)) ((x + 5) (x + 8)))}{(x + 5) (- (x + 5) (x + 8))}$

Step 14.2.2

Cancel the common factor.

$\frac{(x + 5) (((x - 5) \cdot (4)) ((x + 5) (x + 8)))}{(x + 5) (- (x + 5) (x + 8))}$

Step 14.2.3

Rewrite the expression.

$\frac{((x - 5) \cdot (4)) ((x + 5) (x + 8))}{- (x + 5) (x + 8)}$

Step 15

Cancel the common factor of $x + 5$ .

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Step 15.1

Cancel the common factor.

$\frac{(x - 5) \cdot (4) ((x + 5) (x + 8))}{- (x + 5) (x + 8)}$

Step 15.2

Rewrite the expression.

$\frac{((x - 5) \cdot (4)) (x + 8)}{- (x + 8)}$

Step 16

Cancel the common factor of $x + 8$ .

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Step 16.1

Cancel the common factor.

$\frac{(x - 5) \cdot (4) (x + 8)}{- (x + 8)}$

Step 16.2

Rewrite the expression.

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

Step 16.3

Move the negative one from the denominator of $\frac{(x - 5) \cdot (4)}{- 1}$ .

$- 1 \cdot ((x - 5) \cdot (4))$

Step 17

Rewrite $- 1 \cdot ((x - 5) \cdot (4))$ as $- ((x - 5) \cdot (4))$ .

$- ((x - 5) \cdot (4))$

Step 18

Apply the distributive property.

$- (x \cdot 4 - 5 \cdot 4)$

Step 19

Simplify the expression.

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Step 19.1

Move $4$ to the left of $x$ .

$- (4 \cdot x - 5 \cdot 4)$

Step 19.2

Multiply $- 5$ by $4$ .

$- (4 \cdot x - 20)$

Step 20

Apply the distributive property.

$- (4 x) - - 20$

Step 21

Multiply.

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Step 21.1

Multiply $4$ by $- 1$ .

$- 4 x - - 20$

Step 21.2

Multiply $- 1$ by $- 20$ .

$- 4 x + 20$