SOLUTION: How many solutions are there to the equation {{{2/(x+1)}}}+{{{4/(x^2-1)}}}=1 A) 0 B) 1 C) 2 D) an infinite number

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Question 1115185: How many solutions are there to the equation 2%2F%28x%2B1%29+4%2F%28x%5E2-1%29=1
A) 0
B) 1
C) 2
D) an infinite number


Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
Multiply the whole equation by x^2-1
2(x-1)+4=x^2-1
x^2-2x-3=0
(x+1)(x-3)=0
x=-1, 3
But x=-1 leads to a denominator of 0 in both fractions so extraneous.
x=3; (2/4)+(4/8)=1
1 solution
B