Simplify ( frac{1}{(x + 1)} + frac{1}{(x − 1)} )
-
A.
2x/(x + 1)(x−3) -
B.
2x/(x + 1)(x−1) -
C.
2x/(x + 1)2 -
D.
2x(x+1)2
Correct Answer: Option B
Explanation
[1 ÷ (x+1)] + [1 ÷ (x − 1)]
= ((x − 1) + [(x + 1)) ÷ (x+1)(x − 1)]
Using the L.C.M.
= (x − 1 + x + 1) ÷ (x + 1)(x − 1)
= (x + 2 − 1 + 1) ÷ (x + 1)(x − 1)
= 2x ÷ (x + 1)(x − 1) =2x ÷ (x + 1)(x − 1)
There is an explanation video available below.