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OpenStudy (anonymous):
Using complete sentences, explain why it is necessary to have common denominators when adding or subtracting rational expressions.
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OpenStudy (anonymous):
You need to have common denominators for adding/subtracting rational expressions for the same reason that you need them for adding/subtracting fractions; proportionate means. You have to make sure that everything is in relative terms before you can compare them and/or combine them.
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