Set the denominator in equal to to find where the expression is undefined.

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 .

Add to both sides of the equation.

The domain is all values of that make the expression defined.

Interval Notation:

Set-Builder Notation:

Find the Domain y=(4x-20)/(x^2-10x+25)