### Home > CCA2 > Chapter Ch6 > Lesson 6.2.2 > Problem6-121

6-121.

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

1. $\frac { 3 } { ( x - 4 ) ( x + 1 ) } + \frac { 6 } { x + 1 }$

Simplify the expression above by creating a common denominator.

Multiply the second fraction by $\frac{(x-4)}{(x-4)}\text{ }$ to make the denominators the same.

2. $\frac { x + 2 } { x ^ { 2 } - 9 } - \frac { 1 } { x + 3 }$

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