What is the domain of f(x)=((x+9))/(x^2-81) ?

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

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domain of f(x)=((x+9))/(x^2-81)

domain

f (x) = \frac{( x + 9 )}{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

f (x) = - 5 x^{2} + 5

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

y = 0.3 (x - 4)^{2} - 7.5

\frac{7}{7 x}

\frac{- x + 5}{- 4 x + 8}

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