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

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

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

domain

f (x) = \frac{2 x ^{2}}{x ^{2} - 9}

x < - 3 or - 3 < x < 3 or x > 3

Solution steps

Find undefined (singularity) points:

x = 3, x = - 3

The function domain

x < - 3 or - 3 < x < 3 or x > 3

f (x) = tan (3 x)

f (x) = ln (- x^{2} + 4)

f (x) = \frac{2 x ^{2} + 1}{x - 3}

f (x) = \frac{3}{( x ^{2} - 9 )}

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

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