Adding and Subtracting Rational Expressions Factor the Denominators

Simplify 

• (x+7)/(x-4)

• -3/4

• (x+3)/(x+4)

• (x+3)/(x-4)

When adding and subtracting rational expressions, my first step should be to:

• Combine like terms in the numerators.

• Determine a Least Common Denominator.

• Factor all of the numerators and all of the denominators.

• Change the operator to multiplication and reciprocate the second fraction.

Perform the operation

• A

• B

• C

• D

• k = 7
• x = 7.1
• x = 7.6
• x = 1/7

Add

• 
• 
• 
• 

• A
• B
• C
• D

• 
• 
• 
• 

• A

• B

• C

• D

• A
• B
• C
• D

Perform the operation

• A

• B

• C

• D