x≠0
x+1≠0 --> x≠-1
D=R-{-1,0}
(x-1)(x+1) - (x-1)x (x-1)(x+1-x) x-1
---------------------- = ----------------------- = ------------------
x(x+1) x(x+1) x(x+1)
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x≠0
x+1≠0 --> x≠-1
D=R-{-1,0}
(x-1)(x+1) - (x-1)x (x-1)(x+1-x) x-1
---------------------- = ----------------------- = ------------------
x(x+1) x(x+1) x(x+1)