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

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

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

domain

f (x) = \frac{x ^{2} - 81}{x - 9}

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

y = (x + 1)

y = - lo g_{3} (x) + 2

y = \frac{sin ( 4 x )}{x}

f (x) = 3 \cdot (\frac{3}{5})^{x + 2} - 4

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