Simplify x/(x^2-x-2)-x/(x^2+4x-12)-2/(x^2+7x+6)

$\frac{x}{x^{2} - x - 2} - \frac{x}{x^{2} + 4 x - 12} - \frac{2}{x^{2} + 7 x + 6}$

Simplify each term.

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

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 $- 2$ and whose sum is $- 1$ .

$- 2, 1$

Write the factored form using these integers.

$\frac{x}{(x - 2) (x + 1)} - \frac{x}{x^{2} + 4 x - 12} - \frac{2}{x^{2} + 7 x + 6}$

Factor $x^{2} + 4 x - 12$ using the AC method.

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 $- 12$ and whose sum is $4$ .

$- 2, 6$

Write the factored form using these integers.

$\frac{x}{(x - 2) (x + 1)} - \frac{x}{(x - 2) (x + 6)} - \frac{2}{x^{2} + 7 x + 6}$

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

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 $6$ and whose sum is $7$ .

$1, 6$

Write the factored form using these integers.

$\frac{x}{(x - 2) (x + 1)} - \frac{x}{(x - 2) (x + 6)} - \frac{2}{(x + 1) (x + 6)}$

Find the common denominator.

Multiply $\frac{x}{(x - 2) (x + 1)}$ by $\frac{x + 6}{x + 6}$ .

$\frac{x}{(x - 2) (x + 1)} \cdot \frac{x + 6}{x + 6} - \frac{x}{(x - 2) (x + 6)} - \frac{2}{(x + 1) (x + 6)}$

Multiply $\frac{x}{(x - 2) (x + 1)}$ by $\frac{x + 6}{x + 6}$ .

$\frac{x (x + 6)}{(x - 2) (x + 1) (x + 6)} - \frac{x}{(x - 2) (x + 6)} - \frac{2}{(x + 1) (x + 6)}$

Multiply $\frac{x}{(x - 2) (x + 6)}$ by $\frac{x + 1}{x + 1}$ .

$\frac{x (x + 6)}{(x - 2) (x + 1) (x + 6)} - (\frac{x}{(x - 2) (x + 6)} \cdot \frac{x + 1}{x + 1}) - \frac{2}{(x + 1) (x + 6)}$

Multiply $\frac{x}{(x - 2) (x + 6)}$ by $\frac{x + 1}{x + 1}$ .

$\frac{x (x + 6)}{(x - 2) (x + 1) (x + 6)} - \frac{x (x + 1)}{(x - 2) (x + 6) (x + 1)} - \frac{2}{(x + 1) (x + 6)}$

Multiply $\frac{2}{(x + 1) (x + 6)}$ by $\frac{x - 2}{x - 2}$ .

$\frac{x (x + 6)}{(x - 2) (x + 1) (x + 6)} - \frac{x (x + 1)}{(x - 2) (x + 6) (x + 1)} - (\frac{2}{(x + 1) (x + 6)} \cdot \frac{x - 2}{x - 2})$

Multiply $\frac{2}{(x + 1) (x + 6)}$ by $\frac{x - 2}{x - 2}$ .

$\frac{x (x + 6)}{(x - 2) (x + 1) (x + 6)} - \frac{x (x + 1)}{(x - 2) (x + 6) (x + 1)} - \frac{2 (x - 2)}{(x + 1) (x + 6) (x - 2)}$

Reorder the factors of $(x - 2) (x + 6) (x + 1)$ .

$\frac{x (x + 6)}{(x - 2) (x + 1) (x + 6)} - \frac{x (x + 1)}{(x + 1) (x + 6) (x - 2)} - \frac{2 (x - 2)}{(x + 1) (x + 6) (x - 2)}$

Combine the numerators over the common denominator.

$\frac{x (x + 6) - x (x + 1) - 2 (x - 2)}{(x + 1) (x + 6) (x - 2)}$

Simplify each term.

Apply the distributive property.

$\frac{x \cdot x + x \cdot 6 - x (x + 1) - 2 (x - 2)}{(x + 1) (x + 6) (x - 2)}$

Multiply $x$ by $x$ .

$\frac{x^{2} + x \cdot 6 - x (x + 1) - 2 (x - 2)}{(x + 1) (x + 6) (x - 2)}$

Move $6$ to the left of $x$ .

$\frac{x^{2} + 6 \cdot x - x (x + 1) - 2 (x - 2)}{(x + 1) (x + 6) (x - 2)}$

Apply the distributive property.

$\frac{x^{2} + 6 x - x \cdot x - x \cdot 1 - 2 (x - 2)}{(x + 1) (x + 6) (x - 2)}$

Multiply $x$ by $x$ by adding the exponents.

Move $x$ .

$\frac{x^{2} + 6 x - (x \cdot x) - x \cdot 1 - 2 (x - 2)}{(x + 1) (x + 6) (x - 2)}$

Multiply $x$ by $x$ .

$\frac{x^{2} + 6 x - x^{2} - x \cdot 1 - 2 (x - 2)}{(x + 1) (x + 6) (x - 2)}$

Multiply $- 1$ by $1$ .

$\frac{x^{2} + 6 x - x^{2} - x - 2 (x - 2)}{(x + 1) (x + 6) (x - 2)}$

Apply the distributive property.

$\frac{x^{2} + 6 x - x^{2} - x - 2 x - 2 \cdot - 2}{(x + 1) (x + 6) (x - 2)}$

Multiply $- 2$ by $- 2$ .

$\frac{x^{2} + 6 x - x^{2} - x - 2 x + 4}{(x + 1) (x + 6) (x - 2)}$

Simplify by adding terms.

Combine the opposite terms in $x^{2} + 6 x - x^{2} - x - 2 x + 4$ .

Subtract $x^{2}$ from $x^{2}$ .

$\frac{6 x + 0 - x - 2 x + 4}{(x + 1) (x + 6) (x - 2)}$

Add $6 x$ and $0$ .

$\frac{6 x - x - 2 x + 4}{(x + 1) (x + 6) (x - 2)}$

Subtract $x$ from $6 x$ .

$\frac{5 x - 2 x + 4}{(x + 1) (x + 6) (x - 2)}$

Subtract $2 x$ from $5 x$ .

$\frac{3 x + 4}{(x + 1) (x + 6) (x - 2)}$

Simplify x/(x^2-x-2)-x/(x^2+4x-12)-2/(x^2+7x+6)

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