Algebra Examples

$\frac{9}{x - 1} + \frac{- 3 x}{x + 6} = \frac{4 x}{x^{2} - 7 x + 6}$

Step 1

Simplify $\frac{9}{x - 1} + \frac{- 3 x}{x + 6}$ .

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Step 1.1

Move the negative in front of the fraction.

$\frac{9}{x - 1} - \frac{3 x}{x + 6} = \frac{4 x}{x^{2} - 7 x + 6}$

Step 1.2

To write $\frac{9}{x - 1}$ as a fraction with a common denominator, multiply by $\frac{x + 6}{x + 6}$ .

$\frac{9}{x - 1} \cdot \frac{x + 6}{x + 6} - \frac{3 x}{x + 6} = \frac{4 x}{x^{2} - 7 x + 6}$

Step 1.3

To write $- \frac{3 x}{x + 6}$ as a fraction with a common denominator, multiply by $\frac{x - 1}{x - 1}$ .

$\frac{9}{x - 1} \cdot \frac{x + 6}{x + 6} - \frac{3 x}{x + 6} \cdot \frac{x - 1}{x - 1} = \frac{4 x}{x^{2} - 7 x + 6}$

Step 1.4

Write each expression with a common denominator of $(x - 1) (x + 6)$ , by multiplying each by an appropriate factor of $1$ .

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Step 1.4.1

Multiply $\frac{9}{x - 1}$ by $\frac{x + 6}{x + 6}$ .

$\frac{9 (x + 6)}{(x - 1) (x + 6)} - \frac{3 x}{x + 6} \cdot \frac{x - 1}{x - 1} = \frac{4 x}{x^{2} - 7 x + 6}$

Step 1.4.2

Multiply $\frac{3 x}{x + 6}$ by $\frac{x - 1}{x - 1}$ .

$\frac{9 (x + 6)}{(x - 1) (x + 6)} - \frac{3 x (x - 1)}{(x + 6) (x - 1)} = \frac{4 x}{x^{2} - 7 x + 6}$

Step 1.4.3

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

$\frac{9 (x + 6)}{(x + 6) (x - 1)} - \frac{3 x (x - 1)}{(x + 6) (x - 1)} = \frac{4 x}{x^{2} - 7 x + 6}$

Step 1.5

Combine the numerators over the common denominator.

$\frac{9 (x + 6) - 3 x (x - 1)}{(x + 6) (x - 1)} = \frac{4 x}{x^{2} - 7 x + 6}$

Step 1.6

Simplify the numerator.

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Step 1.6.1

Factor $3$ out of $9 (x + 6) - 3 x (x - 1)$ .

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Step 1.6.1.1

Factor $3$ out of $9 (x + 6)$ .

$\frac{3 (3 (x + 6)) - 3 x (x - 1)}{(x + 6) (x - 1)} = \frac{4 x}{x^{2} - 7 x + 6}$

Step 1.6.1.2

Factor $3$ out of $- 3 x (x - 1)$ .

$\frac{3 (3 (x + 6)) + 3 (- x (x - 1))}{(x + 6) (x - 1)} = \frac{4 x}{x^{2} - 7 x + 6}$

Step 1.6.1.3

Factor $3$ out of $3 (3 (x + 6)) + 3 (- x (x - 1))$ .

$\frac{3 (3 (x + 6) - x (x - 1))}{(x + 6) (x - 1)} = \frac{4 x}{x^{2} - 7 x + 6}$

Step 1.6.2

Apply the distributive property.

$\frac{3 (3 x + 3 \cdot 6 - x (x - 1))}{(x + 6) (x - 1)} = \frac{4 x}{x^{2} - 7 x + 6}$

Step 1.6.3

Multiply $3$ by $6$ .

$\frac{3 (3 x + 18 - x (x - 1))}{(x + 6) (x - 1)} = \frac{4 x}{x^{2} - 7 x + 6}$

Step 1.6.4

Apply the distributive property.

$\frac{3 (3 x + 18 - x \cdot x - x \cdot - 1)}{(x + 6) (x - 1)} = \frac{4 x}{x^{2} - 7 x + 6}$

Step 1.6.5

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

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Step 1.6.5.1

Move $x$ .

$\frac{3 (3 x + 18 - (x \cdot x) - x \cdot - 1)}{(x + 6) (x - 1)} = \frac{4 x}{x^{2} - 7 x + 6}$

Step 1.6.5.2

Multiply $x$ by $x$ .

$\frac{3 (3 x + 18 - x^{2} - x \cdot - 1)}{(x + 6) (x - 1)} = \frac{4 x}{x^{2} - 7 x + 6}$

Step 1.6.6

Multiply $- x \cdot - 1$ .

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Step 1.6.6.1

Multiply $- 1$ by $- 1$ .

$\frac{3 (3 x + 18 - x^{2} + 1 x)}{(x + 6) (x - 1)} = \frac{4 x}{x^{2} - 7 x + 6}$

Step 1.6.6.2

Multiply $x$ by $1$ .

$\frac{3 (3 x + 18 - x^{2} + x)}{(x + 6) (x - 1)} = \frac{4 x}{x^{2} - 7 x + 6}$

Step 1.6.7

Add $3 x$ and $x$ .

$\frac{3 (4 x + 18 - x^{2})}{(x + 6) (x - 1)} = \frac{4 x}{x^{2} - 7 x + 6}$

Step 1.6.8

Reorder terms.

$\frac{3 (- x^{2} + 4 x + 18)}{(x + 6) (x - 1)} = \frac{4 x}{x^{2} - 7 x + 6}$

Step 1.7

Simplify with factoring out.

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Step 1.7.1

Factor $- 1$ out of $- x^{2}$ .

$\frac{3 (- (x^{2}) + 4 x + 18)}{(x + 6) (x - 1)} = \frac{4 x}{x^{2} - 7 x + 6}$

Step 1.7.2

Factor $- 1$ out of $4 x$ .

$\frac{3 (- (x^{2}) - (- 4 x) + 18)}{(x + 6) (x - 1)} = \frac{4 x}{x^{2} - 7 x + 6}$

Step 1.7.3

Factor $- 1$ out of $- (x^{2}) - (- 4 x)$ .

$\frac{3 (- (x^{2} - 4 x) + 18)}{(x + 6) (x - 1)} = \frac{4 x}{x^{2} - 7 x + 6}$

Step 1.7.4

Rewrite $18$ as $- 1 (- 18)$ .

$\frac{3 (- (x^{2} - 4 x) - 1 (- 18))}{(x + 6) (x - 1)} = \frac{4 x}{x^{2} - 7 x + 6}$

Step 1.7.5

Factor $- 1$ out of $- (x^{2} - 4 x) - 1 (- 18)$ .

$\frac{3 (- (x^{2} - 4 x - 18))}{(x + 6) (x - 1)} = \frac{4 x}{x^{2} - 7 x + 6}$

Step 1.7.6

Simplify the expression.

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Step 1.7.6.1

Rewrite $- (x^{2} - 4 x - 18)$ as $- 1 (x^{2} - 4 x - 18)$ .

$\frac{3 (- 1 (x^{2} - 4 x - 18))}{(x + 6) (x - 1)} = \frac{4 x}{x^{2} - 7 x + 6}$

Step 1.7.6.2

Move the negative in front of the fraction.

$- \frac{3 (x^{2} - 4 x - 18)}{(x + 6) (x - 1)} = \frac{4 x}{x^{2} - 7 x + 6}$

Step 2

Factor $x^{2} - 7 x + 6$ 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 $6$ and whose sum is $- 7$ .

$- 6, - 1$

Step 2.2

Write the factored form using these integers.

$- \frac{3 (x^{2} - 4 x - 18)}{(x + 6) (x - 1)} = \frac{4 x}{(x - 6) (x - 1)}$

Step 3

Graph each side of the equation. The solution is the x-value of the point of intersection.

$x \approx - 2.54179651$

Step 4