Find Where Undefined/Discontinuous f(x)=(-x^2-9x-20)/(x+4)

$f (x) = \frac{- x^{2} - 9 x - 20}{x + 4}$

Step 1

Set the denominator in $\frac{- x^{2} - 9 x - 20}{x + 4}$ equal to $0$ to find where the expression is undefined.