Algebra Examples

$\frac{x - 7}{x + 9}$

Step 1

Set the denominator in $\frac{x - 7}{x + 9}$ equal to $0$ to find where the expression is undefined.

$x + 9 = 0$

Step 2

Subtract $9$ from both sides of the equation.

$x = - 9$

Step 3