Lesson 11-8 Rational Equations – We learned how to solve rational equations. We practiced using the cross product to solve rational expressions when both sides of the equation are single fractions. Then we learned how to solve rational equations by multiplying each side of the equation by the LCD to eliminate fractions. Next, we learned how to determine which solutions are extraneous solutions. We reviewed the fact that any value of a variable that makes the denominator of a rational expression zero must be excluded from the domain. In the same way, when a solution of a rational equation results in a zero in the denominator, that solution must be excluded. These solutions are called extraneous solutions.