Precalculus Examples

$\frac{x^{2} + x - 56}{x^{2} + x - 42} \cdot \frac{x^{2} + 6 x + 8}{x^{2} - 6 x - 7} \div \frac{x + 4}{x^{2 + 8 x + 7}}$

Step 1

Factor $x^{2} + x - 56$ 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 $- 56$ and whose sum is $1$ .

$- 7, 8$

Step 1.2

Write the factored form using these integers.

$\frac{(x - 7) (x + 8)}{x^{2} + x - 42} \cdot \frac{x^{2} + 6 x + 8}{x^{2} - 6 x - 7} \div \frac{x + 4}{x^{2 + 8 x + 7}}$

Step 2

Factor $x^{2} + x - 42$ 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 $- 42$ and whose sum is $1$ .

$- 6, 7$

Step 2.2

Write the factored form using these integers.

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

Step 3

Factor $x^{2} + 6 x + 8$ 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 $6$ .

$2, 4$

Step 3.2

Write the factored form using these integers.

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

Step 4

Factor $x^{2} - 6 x - 7$ using the AC method.

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Step 4.1

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 $- 7$ and whose sum is $- 6$ .

$- 7, 1$

Step 4.2

Write the factored form using these integers.

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