Algebra Examples

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

Step 1

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

$x + 4 = 0$

Step 2

Subtract $4$ from both sides of the equation.

$x = - 4$

Step 3