# Chapter 11 - Rational Expressions and Functions - 11-4 Adding and Subtracting Rational Expressions - Lesson Check: 7

a) Yes, your friend is correct. Because she is multiplying the denominators together, the product will be a common denominator. b) However, unless the denominators are prime numbers and different variables, you will not get the Least Common Denominator, ultimately making your work harder.

#### Work Step by Step

a) Yes, your friend is correct. Because she is multiplying the denominators together, the product will be a common denominator. b) However, unless the denominators are prime numbers and different variables, you will not get the Least Common Denominator, ultimately making your work harder.

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