CPM Homework Help : INT3 Problem 12-61

Add or subtract and simplify each of the following expressions.

$\frac { 3 } { ( x - 4 ) ( x + 1 ) } + \frac { 6 } { x + 1 }$
Hint (a):
Simplify the expression above by creating a common denominator.
More Help (a):
$\text{Multiply the second fraction by }\frac{(x-4)}{(x-4)} \text{ to make the denominators the same.}$

$\frac { x + 2 } { x ^ { 2 } - 9 } - \frac { 1 } { x + 3 }$
Hint (b):
Factor the denominator in the first term. What do you need to multiply the second fraction by to get a common denominator?