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

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

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domain of f(x)=ln(x^2-81)

domain

f (x) = ln (x^{2} - 81)

x < - 9 or x > 9

Interval Notation

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

Solution steps

Find positive values for logs:

x < - 9 or x > 9

The function domain

x < - 9 or x > 9

\frac{x ^{2} + x - 30}{x ^{2} - 4 x - 5}

f (x) = x^{2} - 12 x

f (x) = \frac{x + 7}{x ^{2} + 14 x + 49}

f (x) = (ln (x))^{l n (x)}

\frac{x ^{3}}{( 4 - x ) ^{2}}

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