Rational Expressions and Their Simplification
A rational number is a fraction, like 2/5. A rational
expression is a ratio in
EXAMPLE: Find all numbers for which each rational expression is undefined.
The expression is undefined if the denominator is zero.
When is the
SIMPLIFYING RATIONAL EXPRESSIONS:
A rational expression can be simplified by dividing out
We can’t cancel common terms:
We can cancel common
EXAMPLE: Simplify the following
EXAMPLE: Find the opposites of the following