# Find Where Undefined/Discontinuous (5x+6)/(x^2+6x+9)

Set the denominator in equal to to find where the expression is undefined.
Solve for .
Factor using the perfect square rule.
Rewrite as .
Check the middle term by multiplying and compare this result with the middle term in the original expression.
Simplify.
Factor using the perfect square trinomial rule , where and .
Set the equal to .
Subtract from both sides of the equation.
The equation is undefined where the denominator equals , the argument of a square root is less than , or the argument of a logarithm is less than or equal to .
Find Where Undefined/Discontinuous (5x+6)/(x^2+6x+9)