Simplifying Radical Expressions
Rules
If and
are real numbers, then

Ex 1 Simplify. Assume all variables represent
positive real numbers.
Ex 2 Simplify.
Distance Formula
The distance between 2 points
and
is given by . 
Ex 3 Find the distance between
and
Midpoint Formula
The midpoint of the line segment whose endpoints are
and
is the point with
coordinates 
Ex 4 Find the midpoint of the line segment that
joins points and
