What is the domain of f(x)=(x^2+x)/(x^2-1) ?

The domain of f(x)=(x^2+x)/(x^2-1) is x 1

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domain of f(x)=(x^2+x)/(x^2-1)

domain

f (x) = \frac{x ^{2} + x}{x ^{2} - 1}

x < - 1 or - 1 < x < 1 or x > 1

Interval Notation

(- \infty, - 1) \cup (- 1, 1) \cup (1, \infty)

Solution steps

Find undefined (singularity) points:

x = 1, x = - 1

The function domain

x < - 1 or - 1 < x < 1 or x > 1

f (x) = lo g_{3} (lo g_{2} (x)) - 1

f (x) = \frac{1}{x} - 1

4 + \frac{5}{x ^{2} - 1}

f (x) = 7 x + 9

f (x) = - x^{2} + 2

What is the domain of f(x)=(x^2+x)/(x^2-1) ?
The domain of f(x)=(x^2+x)/(x^2-1) is x<-1\lor-1<x<1\lor x>1