Answer
$b. (x+1)^{2}$
Work Step by Step
The lowest common denominator for this problem can be found by comparing the three denominators.
1. $(x+1)$
2. $(x+1)(x+1)$
3. $(x+1)$
If we multiply the first and third denominators by $(x+1)$ we will arrive at a LCD of $(x+1)^{2}$.
