Algebra Examples

$\frac{x^{2} + 4 x - 5}{x^{2} + 7 x - 8} \cdot \frac{20 x - 4 x^{2}}{x^{2} + x - 30} \cdot \frac{x^{2} + 14 x + 48}{x + 5}$

Step 1

Factor $x^{2} + 14 x + 48$ 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 $48$ and whose sum is $14$ .

$6, 8$

Step 1.2

Write the factored form using these integers.

$\frac{x^{2} + 4 x - 5}{x^{2} + 7 x - 8} \cdot \frac{20 x - 4 x^{2}}{x^{2} + x - 30} \cdot \frac{(x + 6) (x + 8)}{x + 5}$

Step 2

Factor $x^{2} + 4 x - 5$ 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 $- 5$ and whose sum is $4$ .

$- 1, 5$

Step 2.2

Write the factored form using these integers.

$\frac{(x - 1) (x + 5)}{x^{2} + 7 x - 8} \cdot \frac{20 x - 4 x^{2}}{x^{2} + x - 30} \cdot \frac{(x + 6) (x + 8)}{x + 5}$

Step 3

Factor $x^{2} + 7 x - 8$ 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 $- 8$ and whose sum is $7$ .

$- 1, 8$

Step 3.2

Write the factored form using these integers.

$\frac{(x - 1) (x + 5)}{(x - 1) (x + 8)} \cdot \frac{20 x - 4 x^{2}}{x^{2} + x - 30} \cdot \frac{(x + 6) (x + 8)}{x + 5}$

Step 4

Factor $4 x$ out of $20 x - 4 x^{2}$ .

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Step 4.1

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

$\frac{(x - 1) (x + 5)}{(x - 1) (x + 8)} \cdot \frac{4 x (5) - 4 x^{2}}{x^{2} + x - 30} \cdot \frac{(x + 6) (x + 8)}{x + 5}$

Step 4.2

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

$\frac{(x - 1) (x + 5)}{(x - 1) (x + 8)} \cdot \frac{4 x (5) + 4 x (- x)}{x^{2} + x - 30} \cdot \frac{(x + 6) (x + 8)}{x + 5}$

Step 4.3

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

$\frac{(x - 1) (x + 5)}{(x - 1) (x + 8)} \cdot \frac{4 x (5 - x)}{x^{2} + x - 30} \cdot \frac{(x + 6) (x + 8)}{x + 5}$

Step 5

Factor $x^{2} + x - 30$ using the AC method.

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Step 5.1

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 $- 30$ and whose sum is $1$ .

$- 5, 6$

Step 5.2

Write the factored form using these integers.

$\frac{(x - 1) (x + 5)}{(x - 1) (x + 8)} \cdot \frac{4 x (5 - x)}{(x - 5) (x + 6)} \cdot \frac{(x + 6) (x + 8)}{x + 5}$

Step 6

Reduce the expression by cancelling the common factors.

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Step 6.1

Cancel the common factor of $x - 1$ .

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Step 6.1.1

Cancel the common factor.

$\frac{(x - 1) (x + 5)}{(x - 1) (x + 8)} \cdot \frac{4 x (5 - x)}{(x - 5) (x + 6)} \cdot \frac{(x + 6) (x + 8)}{x + 5}$

Step 6.1.2

Rewrite the expression.

$\frac{x + 5}{x + 8} \cdot \frac{4 x (5 - x)}{(x - 5) (x + 6)} \cdot \frac{(x + 6) (x + 8)}{x + 5}$

Step 6.2

Cancel the common factor of $5 - x$ and $x - 5$ .

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Step 6.2.1

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

$\frac{x + 5}{x + 8} \cdot \frac{4 x (- 1 (- 5) - x)}{(x - 5) (x + 6)} \cdot \frac{(x + 6) (x + 8)}{x + 5}$

Step 6.2.2

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

$\frac{x + 5}{x + 8} \cdot \frac{4 x (- 1 (- 5) - (x))}{(x - 5) (x + 6)} \cdot \frac{(x + 6) (x + 8)}{x + 5}$

Step 6.2.3

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

$\frac{x + 5}{x + 8} \cdot \frac{4 x (- 1 (- 5 + x))}{(x - 5) (x + 6)} \cdot \frac{(x + 6) (x + 8)}{x + 5}$

Step 6.2.4

Reorder terms.

$\frac{x + 5}{x + 8} \cdot \frac{4 x (- 1 (x - 5))}{(x - 5) (x + 6)} \cdot \frac{(x + 6) (x + 8)}{x + 5}$

Step 6.2.5

Cancel the common factor.

$\frac{x + 5}{x + 8} \cdot \frac{4 x (- 1 (x - 5))}{(x - 5) (x + 6)} \cdot \frac{(x + 6) (x + 8)}{x + 5}$

Step 6.2.6

Rewrite the expression.

$\frac{x + 5}{x + 8} \cdot \frac{4 x \cdot (- 1)}{x + 6} \cdot \frac{(x + 6) (x + 8)}{x + 5}$

Step 7

Multiply $- 1$ by $4$ .

$\frac{x + 5}{x + 8} \cdot \frac{- 4 x}{x + 6} \cdot \frac{(x + 6) (x + 8)}{x + 5}$

Step 8

Simplify terms.

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Step 8.1

Move the negative in front of the fraction.

$\frac{x + 5}{x + 8} \cdot (- \frac{4 x}{x + 6}) \cdot \frac{(x + 6) (x + 8)}{x + 5}$

Step 8.2

Rewrite using the commutative property of multiplication.

$- \frac{x + 5}{x + 8} \cdot \frac{4 x}{x + 6} \cdot \frac{(x + 6) (x + 8)}{x + 5}$

Step 8.3

Multiply $\frac{4 x}{x + 6}$ by $\frac{x + 5}{x + 8}$ .

$- \frac{4 x (x + 5)}{(x + 6) (x + 8)} \cdot \frac{(x + 6) (x + 8)}{x + 5}$

Step 8.4

Cancel the common factor of $x + 5$ .

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Step 8.4.1

Move the leading negative in $- \frac{4 x (x + 5)}{(x + 6) (x + 8)}$ into the numerator.

$\frac{- 4 x (x + 5)}{(x + 6) (x + 8)} \cdot \frac{(x + 6) (x + 8)}{x + 5}$

Step 8.4.2

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

$\frac{(x + 5) (- 4 x)}{(x + 6) (x + 8)} \cdot \frac{(x + 6) (x + 8)}{x + 5}$

Step 8.4.3

Cancel the common factor.

$\frac{(x + 5) (- 4 x)}{(x + 6) (x + 8)} \cdot \frac{(x + 6) (x + 8)}{x + 5}$

Step 8.4.4

Rewrite the expression.

$\frac{- 4 x}{(x + 6) (x + 8)} \cdot ((x + 6) (x + 8))$

Step 8.5

Cancel the common factor of $(x + 6) (x + 8)$ .

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Step 8.5.1

Cancel the common factor.

$\frac{- 4 x}{(x + 6) (x + 8)} \cdot ((x + 6) (x + 8))$

Step 8.5.2

Rewrite the expression.

$- 4 x$