What is the domain of f(x)=(4x)/(9-x) ?

The domain of f(x)=(4x)/(9-x) is x 9

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domain of f(x)=(4x)/(9-x)

domain

f (x) = \frac{4 x}{9 - x}

x < 9 or x > 9

Interval Notation

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

Solution steps

Find undefined (singularity) points:

x = 9

The function domain

x < 9 or x > 9

f (x) = 4 - 2 e^{x}

f (x) = \frac{x - 2}{x ^{2} + 4 x - 21}

f (x) = 3 cos (x) + 1

y = 5 x + 50

f (x) = \frac{x}{x - 4}

What is the domain of f(x)=(4x)/(9-x) ?
The domain of f(x)=(4x)/(9-x) is x<9\lor x>9