### Home > CCA2 > Chapter 6 > Lesson 6.2.2 > Problem 6-121

6-121.

Add or subtract and simplify each of the following expressions. Justify that each step of your process makes sense.

Simplify the expression above by creating a common denominator.

Multiply the second fraction by

to make the denominators the same. Factor the denominator in the first term. What do you need to multiply the second fraction by to get a common denominator?