Find Where Undefined/Discontinuous f(x)=(x^2-400)/(x-20)

$f (x) = \frac{x^{2} - 400}{x - 20}$

Set the denominator in $\frac{x^{2} - 400}{x - 20}$ equal to $0$ to find where the expression is undefined.

$x - 20 = 0$

Add $20$ to both sides of the equation.

$x = 20$

The equation is undefined where the denominator equals $0$ , the argument of a square root is less than $0$ , or the argument of a logarithm is less than or equal to $0$ .

$x = 20$

Find Where Undefined/Discontinuous f(x)=(x^2-400)/(x-20)

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