# Precalculus Examples

,
Replace the function designators with the actual functions in .
Set the denominator in equal to to find where the expression is undefined.
Divide each term by and simplify.
Divide each term in by .
Reduce the expression by cancelling the common factors.
Cancel the common factor.
Divide by .
Divide by .
The domain is all values of that make the expression defined.
Interval Notation:
Set-Builder Notation: