January 18, 2013
Lesson 7.1
Simplifying Rational Expressions
A rational expression is one the can be written in
the form
P
, where P and Q are polynomials and Q ≠ 0.
Q
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To determine the value(s) that make a rational
expression undefined
1. Write an equation that has the denominator
set equal to zero.
2. Solve the equation.
Find every value for the variable that makes the
expression undefined.
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3
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