Solve by Factoring k/(k+1)+k/(k-2)=2

$\frac{k}{k + 1} + \frac{k}{k - 2} = 2$

Move $2$ to the left side of the equation by subtracting it from both sides.

$\frac{k}{k + 1} + \frac{k}{k - 2} - 2 = 0$

Simplify $\frac{k}{k + 1} + \frac{k}{k - 2} - 2$ .

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To write $\frac{k}{k + 1}$ as a fraction with a common denominator, multiply by $\frac{k - 2}{k - 2}$ .

$\frac{k}{k + 1} \cdot \frac{k - 2}{k - 2} + \frac{k}{k - 2} - 2 = 0$

To write $\frac{k}{k - 2}$ as a fraction with a common denominator, multiply by $\frac{k + 1}{k + 1}$ .

$\frac{k}{k + 1} \cdot \frac{k - 2}{k - 2} + \frac{k}{k - 2} \cdot \frac{k + 1}{k + 1} - 2 = 0$

Write each expression with a common denominator of $(k + 1) (k - 2)$ , by multiplying each by an appropriate factor of $1$ .

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Multiply $\frac{k}{k + 1}$ and $\frac{k - 2}{k - 2}$ .

$\frac{k (k - 2)}{(k + 1) (k - 2)} + \frac{k}{k - 2} \cdot \frac{k + 1}{k + 1} - 2 = 0$

Multiply $\frac{k}{k - 2}$ and $\frac{k + 1}{k + 1}$ .

$\frac{k (k - 2)}{(k + 1) (k - 2)} + \frac{k (k + 1)}{(k - 2) (k + 1)} - 2 = 0$

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

$\frac{k (k - 2)}{(k + 1) (k - 2)} + \frac{k (k + 1)}{(k + 1) (k - 2)} - 2 = 0$

Combine the numerators over the common denominator.

$\frac{k (k - 2) + k (k + 1)}{(k + 1) (k - 2)} - 2 = 0$

Simplify the numerator.

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Factor $k$ out of $k (k - 2) + k (k + 1)$ .

$\frac{k (k - 2 + k + 1)}{(k + 1) (k - 2)} - 2 = 0$

Add $k$ and $k$ .

$\frac{k (2 k - 2 + 1)}{(k + 1) (k - 2)} - 2 = 0$

Add $- 2$ and $1$ .

$\frac{k (2 k - 1)}{(k + 1) (k - 2)} - 2 = 0$

To write $- 2$ as a fraction with a common denominator, multiply by $\frac{(k + 1) (k - 2)}{(k + 1) (k - 2)}$ .

$\frac{k (2 k - 1)}{(k + 1) (k - 2)} - 2 \cdot \frac{(k + 1) (k - 2)}{(k + 1) (k - 2)} = 0$

Simplify terms.

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Combine $- 2$ and $\frac{(k + 1) (k - 2)}{(k + 1) (k - 2)}$ .

$\frac{k (2 k - 1)}{(k + 1) (k - 2)} + \frac{- 2 ((k + 1) (k - 2))}{(k + 1) (k - 2)} = 0$

Combine the numerators over the common denominator.

$\frac{k (2 k - 1) - 2 ((k + 1) (k - 2))}{(k + 1) (k - 2)} = 0$

Simplify the numerator.

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Apply the distributive property.

$\frac{k (2 k) + k \cdot - 1 - 2 ((k + 1) (k - 2))}{(k + 1) (k - 2)} = 0$

Rewrite using the commutative property of multiplication.

$\frac{2 k \cdot k + k \cdot - 1 - 2 ((k + 1) (k - 2))}{(k + 1) (k - 2)} = 0$

Move $- 1$ to the left of $k$ .

$\frac{2 k \cdot k - 1 \cdot k - 2 ((k + 1) (k - 2))}{(k + 1) (k - 2)} = 0$

Simplify each term.

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Multiply $k$ by $k$ by adding the exponents.

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Move $k$ .

$\frac{2 (k \cdot k) - 1 \cdot k - 2 ((k + 1) (k - 2))}{(k + 1) (k - 2)} = 0$

Multiply $k$ by $k$ .

$\frac{2 k^{2} - 1 \cdot k - 2 ((k + 1) (k - 2))}{(k + 1) (k - 2)} = 0$

Rewrite $- 1 k$ as $- k$ .

$\frac{2 k^{2} - k - 2 ((k + 1) (k - 2))}{(k + 1) (k - 2)} = 0$

Expand $(k + 1) (k - 2)$ using the FOIL Method.

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Apply the distributive property.

$\frac{2 k^{2} - k - 2 (k (k - 2) + 1 (k - 2))}{(k + 1) (k - 2)} = 0$

Apply the distributive property.

$\frac{2 k^{2} - k - 2 (k \cdot k + k \cdot - 2 + 1 (k - 2))}{(k + 1) (k - 2)} = 0$

Apply the distributive property.

$\frac{2 k^{2} - k - 2 (k \cdot k + k \cdot - 2 + 1 k + 1 \cdot - 2)}{(k + 1) (k - 2)} = 0$

Simplify and combine like terms.

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Simplify each term.

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Multiply $k$ by $k$ .

$\frac{2 k^{2} - k - 2 (k^{2} + k \cdot - 2 + 1 k + 1 \cdot - 2)}{(k + 1) (k - 2)} = 0$

Move $- 2$ to the left of $k$ .

$\frac{2 k^{2} - k - 2 (k^{2} - 2 \cdot k + 1 k + 1 \cdot - 2)}{(k + 1) (k - 2)} = 0$

Multiply $k$ by $1$ .

$\frac{2 k^{2} - k - 2 (k^{2} - 2 k + k + 1 \cdot - 2)}{(k + 1) (k - 2)} = 0$

Multiply $- 2$ by $1$ .

$\frac{2 k^{2} - k - 2 (k^{2} - 2 k + k - 2)}{(k + 1) (k - 2)} = 0$

Add $- 2 k$ and $k$ .

$\frac{2 k^{2} - k - 2 (k^{2} - k - 2)}{(k + 1) (k - 2)} = 0$

Apply the distributive property.

$\frac{2 k^{2} - k - 2 k^{2} - 2 (- k) - 2 \cdot - 2}{(k + 1) (k - 2)} = 0$

Simplify.

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Multiply $- 1$ by $- 2$ .

$\frac{2 k^{2} - k - 2 k^{2} + 2 k - 2 \cdot - 2}{(k + 1) (k - 2)} = 0$

Multiply $- 2$ by $- 2$ .

$\frac{2 k^{2} - k - 2 k^{2} + 2 k + 4}{(k + 1) (k - 2)} = 0$

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

$\frac{- k + 0 + 2 k + 4}{(k + 1) (k - 2)} = 0$

Add $- k$ and $0$ .

$\frac{- k + 2 k + 4}{(k + 1) (k - 2)} = 0$

Add $- k$ and $2 k$ .

$\frac{k + 4}{(k + 1) (k - 2)} = 0$

To write $\frac{k}{k + 1}$ as a fraction with a common denominator, multiply by $\frac{k - 2}{k - 2}$ .

$\frac{k}{k + 1} \cdot \frac{k - 2}{k - 2} + \frac{k}{k - 2} - 2 = 0$

To write $\frac{k}{k - 2}$ as a fraction with a common denominator, multiply by $\frac{k + 1}{k + 1}$ .

$\frac{k}{k + 1} \cdot \frac{k - 2}{k - 2} + \frac{k}{k - 2} \cdot \frac{k + 1}{k + 1} - 2 = 0$

Write each expression with a common denominator of $(k + 1) (k - 2)$ , by multiplying each by an appropriate factor of $1$ .

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Multiply $\frac{k}{k + 1}$ and $\frac{k - 2}{k - 2}$ .

$\frac{k (k - 2)}{(k + 1) (k - 2)} + \frac{k}{k - 2} \cdot \frac{k + 1}{k + 1} - 2 = 0$

Multiply $\frac{k}{k - 2}$ and $\frac{k + 1}{k + 1}$ .

$\frac{k (k - 2)}{(k + 1) (k - 2)} + \frac{k (k + 1)}{(k - 2) (k + 1)} - 2 = 0$

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

$\frac{k (k - 2)}{(k + 1) (k - 2)} + \frac{k (k + 1)}{(k + 1) (k - 2)} - 2 = 0$

Combine the numerators over the common denominator.

$\frac{k (k - 2) + k (k + 1)}{(k + 1) (k - 2)} - 2 = 0$

Simplify the numerator.

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Factor $k$ out of $k (k - 2) + k (k + 1)$ .

$\frac{k (k - 2 + k + 1)}{(k + 1) (k - 2)} - 2 = 0$

Add $k$ and $k$ .

$\frac{k (2 k - 2 + 1)}{(k + 1) (k - 2)} - 2 = 0$

Add $- 2$ and $1$ .

$\frac{k (2 k - 1)}{(k + 1) (k - 2)} - 2 = 0$

To write $- 2$ as a fraction with a common denominator, multiply by $\frac{(k + 1) (k - 2)}{(k + 1) (k - 2)}$ .

$\frac{k (2 k - 1)}{(k + 1) (k - 2)} - 2 \cdot \frac{(k + 1) (k - 2)}{(k + 1) (k - 2)} = 0$

Simplify terms.

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Combine $- 2$ and $\frac{(k + 1) (k - 2)}{(k + 1) (k - 2)}$ .

$\frac{k (2 k - 1)}{(k + 1) (k - 2)} + \frac{- 2 ((k + 1) (k - 2))}{(k + 1) (k - 2)} = 0$

Combine the numerators over the common denominator.

$\frac{k (2 k - 1) - 2 ((k + 1) (k - 2))}{(k + 1) (k - 2)} = 0$

Simplify the numerator.

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Apply the distributive property.

$\frac{k (2 k) + k \cdot - 1 - 2 ((k + 1) (k - 2))}{(k + 1) (k - 2)} = 0$

Rewrite using the commutative property of multiplication.

$\frac{2 k \cdot k + k \cdot - 1 - 2 ((k + 1) (k - 2))}{(k + 1) (k - 2)} = 0$

Move $- 1$ to the left of $k$ .

$\frac{2 k \cdot k - 1 \cdot k - 2 ((k + 1) (k - 2))}{(k + 1) (k - 2)} = 0$

Simplify each term.

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Multiply $k$ by $k$ by adding the exponents.

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Move $k$ .

$\frac{2 (k \cdot k) - 1 \cdot k - 2 ((k + 1) (k - 2))}{(k + 1) (k - 2)} = 0$

Multiply $k$ by $k$ .

$\frac{2 k^{2} - 1 \cdot k - 2 ((k + 1) (k - 2))}{(k + 1) (k - 2)} = 0$

Rewrite $- 1 k$ as $- k$ .

$\frac{2 k^{2} - k - 2 ((k + 1) (k - 2))}{(k + 1) (k - 2)} = 0$

Expand $(k + 1) (k - 2)$ using the FOIL Method.

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Apply the distributive property.

$\frac{2 k^{2} - k - 2 (k (k - 2) + 1 (k - 2))}{(k + 1) (k - 2)} = 0$

Apply the distributive property.

$\frac{2 k^{2} - k - 2 (k \cdot k + k \cdot - 2 + 1 (k - 2))}{(k + 1) (k - 2)} = 0$

Apply the distributive property.

$\frac{2 k^{2} - k - 2 (k \cdot k + k \cdot - 2 + 1 k + 1 \cdot - 2)}{(k + 1) (k - 2)} = 0$

Simplify and combine like terms.

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Simplify each term.

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Multiply $k$ by $k$ .

$\frac{2 k^{2} - k - 2 (k^{2} + k \cdot - 2 + 1 k + 1 \cdot - 2)}{(k + 1) (k - 2)} = 0$

Move $- 2$ to the left of $k$ .

$\frac{2 k^{2} - k - 2 (k^{2} - 2 \cdot k + 1 k + 1 \cdot - 2)}{(k + 1) (k - 2)} = 0$

Multiply $k$ by $1$ .

$\frac{2 k^{2} - k - 2 (k^{2} - 2 k + k + 1 \cdot - 2)}{(k + 1) (k - 2)} = 0$

Multiply $- 2$ by $1$ .

$\frac{2 k^{2} - k - 2 (k^{2} - 2 k + k - 2)}{(k + 1) (k - 2)} = 0$

Add $- 2 k$ and $k$ .

$\frac{2 k^{2} - k - 2 (k^{2} - k - 2)}{(k + 1) (k - 2)} = 0$

Apply the distributive property.

$\frac{2 k^{2} - k - 2 k^{2} - 2 (- k) - 2 \cdot - 2}{(k + 1) (k - 2)} = 0$

Simplify.

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Multiply $- 1$ by $- 2$ .

$\frac{2 k^{2} - k - 2 k^{2} + 2 k - 2 \cdot - 2}{(k + 1) (k - 2)} = 0$

Multiply $- 2$ by $- 2$ .

$\frac{2 k^{2} - k - 2 k^{2} + 2 k + 4}{(k + 1) (k - 2)} = 0$

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

$\frac{- k + 0 + 2 k + 4}{(k + 1) (k - 2)} = 0$

Add $- k$ and $0$ .

$\frac{- k + 2 k + 4}{(k + 1) (k - 2)} = 0$

Add $- k$ and $2 k$ .

$\frac{k + 4}{(k + 1) (k - 2)} = 0$

Find the LCD of the terms in the equation.

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Finding the LCD of a list of values is the same as finding the LCM of the denominators of those values.

$(k + 1) (k - 2), 1$

The LCM is the smallest positive number that all of the numbers divide into evenly.

1. List the prime factors of each number.

2. Multiply each factor the greatest number of times it occurs in either number.

The number $1$ is not a prime number because it only has one positive factor, which is itself.

Not prime

The LCM of $1, 1$ is the result of multiplying all prime factors the greatest number of times they occur in either number.

$1$

The factor for $k + 1$ is $k + 1$ itself.

$(k + 1) = k + 1$

$(k + 1)$ occurs $1$ time.

The factor for $k - 2$ is $k - 2$ itself.

$(k - 2) = k - 2$

$(k - 2)$ occurs $1$ time.

The LCM of $k + 1, k - 2$ is the result of multiplying all factors the greatest number of times they occur in either term.

$(k + 1) (k - 2)$

Multiply each term by $(k + 1) (k - 2)$ and simplify.

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Multiply each term in $\frac{k + 4}{(k + 1) (k - 2)} = 0$ by $(k + 1) (k - 2)$ in order to remove all the denominators from the equation.

$\frac{k + 4}{(k + 1) (k - 2)} \cdot ((k + 1) (k - 2)) = 0 \cdot ((k + 1) (k - 2))$

Cancel the common factor of $(k + 1) (k - 2)$ .

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Cancel the common factor.

$\frac{k + 4}{(k + 1) (k - 2)} \cdot ((k + 1) (k - 2)) = 0 \cdot ((k + 1) (k - 2))$

Rewrite the expression.

$k + 4 = 0 \cdot ((k + 1) (k - 2))$

Simplify $0 \cdot ((k + 1) (k - 2))$ .

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Expand $(k + 1) (k - 2)$ using the FOIL Method.

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Apply the distributive property.

$k + 4 = 0 \cdot (k (k - 2) + 1 (k - 2))$

Apply the distributive property.

$k + 4 = 0 \cdot (k \cdot k + k \cdot - 2 + 1 (k - 2))$

Apply the distributive property.

$k + 4 = 0 \cdot (k \cdot k + k \cdot - 2 + 1 k + 1 \cdot - 2)$

Simplify and combine like terms.

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Simplify each term.

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Multiply $k$ by $k$ .

$k + 4 = 0 \cdot (k^{2} + k \cdot - 2 + 1 k + 1 \cdot - 2)$

Move $- 2$ to the left of $k$ .

$k + 4 = 0 \cdot (k^{2} - 2 \cdot k + 1 k + 1 \cdot - 2)$

Multiply $k$ by $1$ .

$k + 4 = 0 \cdot (k^{2} - 2 k + k + 1 \cdot - 2)$

Multiply $- 2$ by $1$ .

$k + 4 = 0 \cdot (k^{2} - 2 k + k - 2)$

Add $- 2 k$ and $k$ .

$k + 4 = 0 \cdot (k^{2} - k - 2)$

Multiply $0$ by $k^{2} - k - 2$ .

$k + 4 = 0$

Subtract $4$ from both sides of the equation.

$k = - 4$

Solve by Factoring k/(k+1)+k/(k-2)=2

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