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

The domain of f(x)= 9/(9/x) is x 0

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domain of f(x)= 9/(9/x)

domain

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

x < 0 or x > 0

Interval Notation

(- \infty, 0) \cup (0, \infty)

Solution steps

Find undefined (singularity) points:

x = 0

The function domain

x < 0 or x > 0

\frac{3}{11}, - \frac{3}{11}

x + 2 y = 7

\frac{x}{x ^{2} + 6 x + 5}

\frac{2 x - 1}{2 x + 1}

x^{3} + 1

What is the domain of f(x)= 9/(9/x) ?
The domain of f(x)= 9/(9/x) is x<0\lor x>0