# Precalculus Examples

Step 1

Step 1.1

For each factor in the denominator, create a new fraction using the factor as the denominator, and an unknown value as the numerator. Since the factor in the denominator is linear, put a single variable in its place .

Step 1.2

For each factor in the denominator, create a new fraction using the factor as the denominator, and an unknown value as the numerator. Since the factor in the denominator is linear, put a single variable in its place .

Step 1.3

Multiply each fraction in the equation by the denominator of the original expression. In this case, the denominator is .

Step 1.4

Cancel the common factor of .

Step 1.4.1

Cancel the common factor.

Step 1.4.2

Rewrite the expression.

Step 1.5

Cancel the common factor of .

Step 1.5.1

Cancel the common factor.

Step 1.5.2

Divide by .

Step 1.6

Simplify each term.

Step 1.6.1

Cancel the common factor of .

Step 1.6.1.1

Cancel the common factor.

Step 1.6.1.2

Divide by .

Step 1.6.2

Apply the distributive property.

Step 1.6.3

Move to the left of .

Step 1.6.4

Cancel the common factor of .

Step 1.6.4.1

Cancel the common factor.

Step 1.6.4.2

Divide by .

Step 1.6.5

Apply the distributive property.

Step 1.6.6

Move to the left of .

Step 1.7

Move .

Step 2

Step 2.1

Create an equation for the partial fraction variables by equating the coefficients of from each side of the equation. For the equation to be equal, the equivalent coefficients on each side of the equation must be equal.

Step 2.2

Create an equation for the partial fraction variables by equating the coefficients of the terms not containing . For the equation to be equal, the equivalent coefficients on each side of the equation must be equal.

Step 2.3

Set up the system of equations to find the coefficients of the partial fractions.

Step 3

Step 3.1

Solve for in .

Step 3.1.1

Rewrite the equation as .

Step 3.1.2

Subtract from both sides of the equation.

Step 3.2

Replace all occurrences of with in each equation.

Step 3.2.1

Replace all occurrences of in with .

Step 3.2.2

Simplify the right side.

Step 3.2.2.1

Simplify .

Step 3.2.2.1.1

Simplify each term.

Step 3.2.2.1.1.1

Apply the distributive property.

Step 3.2.2.1.1.2

Multiply by .

Step 3.2.2.1.1.3

Multiply by .

Step 3.2.2.1.2

Subtract from .

Step 3.3

Solve for in .

Step 3.3.1

Rewrite the equation as .

Step 3.3.2

Subtract from both sides of the equation.

Step 3.3.3

Divide each term in by and simplify.

Step 3.3.3.1

Divide each term in by .

Step 3.3.3.2

Simplify the left side.

Step 3.3.3.2.1

Cancel the common factor of .

Step 3.3.3.2.1.1

Cancel the common factor.

Step 3.3.3.2.1.2

Divide by .

Step 3.3.3.3

Simplify the right side.

Step 3.3.3.3.1

Dividing two negative values results in a positive value.

Step 3.4

Replace all occurrences of with in each equation.

Step 3.4.1

Replace all occurrences of in with .

Step 3.4.2

Simplify the right side.

Step 3.4.2.1

Simplify .

Step 3.4.2.1.1

Write as a fraction with a common denominator.

Step 3.4.2.1.2

Combine the numerators over the common denominator.

Step 3.4.2.1.3

Subtract from .

Step 3.5

List all of the solutions.

Step 4

Replace each of the partial fraction coefficients in with the values found for and .