What is the domain of f(x)=(3x)/(x^2-81) ?

The domain of f(x)=(3x)/(x^2-81) is x 9

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domain of f(x)=(3x)/(x^2-81)

domain

f (x) = \frac{3 x}{x ^{2} - 81}

x < - 9 or - 9 < x < 9 or x > 9

Interval Notation

(- \infty, - 9) \cup (- 9, 9) \cup (9, \infty)

Solution steps

Find undefined (singularity) points:

x = 9, x = - 9

The function domain

x < - 9 or - 9 < x < 9 or x > 9

2 x + y = 4

\frac{( x - 5 ) ( x + 1 )}{( x + 1 ) ( x - 2 ) x}

f (x) = \frac{9 e ^{x}}{1 + e ^{- x}}

f (x) = 500 + 0.1 x

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

What is the domain of f(x)=(3x)/(x^2-81) ?
The domain of f(x)=(3x)/(x^2-81) is x<-9\lor-9<x<9\lor x>9