Opposites in a Rational Expression The opposite of a - b is b - a . Multiplication of Rational Expressions If p , q , r , and s are polynomials where q ≠ 0 , s ≠ 0 , then p q · r s = p r q s

rational expression — A rational expression is an expression of the form p q , where p and q are polynomials and q ≠ 0. complex rational expression — A complex rational expression is a rational expression in which the numerator and/or denominator contains a rational expression. rational function — A rational function is a function of the form R ( x ) = p ( x ) q ( x ) where p ( x ) and q ( x ) are polynomial functions and q ( x ) is not zero. similar figures — Two figures are similar if the measures of their corresponding angles are equal and their corresponding sides have the same ratio.

Be able to determine the values for which a rational expression is undefined. Step 1. Set the denominator equal to zero; solve a rational inequality. Step 1. Write the inequality as one quotient on the left and zero on the right.