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This Concept Map, created with IHMC CmapTools, has information related to: Rational Expressions, Rational Expressions what is a rational expression? why is a rational expression undefined for some values of x? P(x)/Q(x), Q(x)≠0, Addition how do I subtract rational expressions ... just like you add them (recall you subtract the numerators rather than adding them) Subtraction, Rational Expressions how do I add or subtract two (or more) rational expressions? ... just like you add and subtract rational numbers (if you multiply by one to create equivalent fractions!) Addition, Rational Expressions how do I simplify rational expressions? ... just like you simplify rational numbers (if you use factorization) Simplification, Simplification how do I multiply rational expressions? ... just like you simplify them (for multiplication, multiply numerators and multiply denominators - factor first, though and leave in factored form) Multiplication, Multiplication how do I divide rational expressions ... just like you multiply them (division is equivalent to multiplication by the reciprocal) Division