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Why should you find the least common denominator when adding or subtracting rational expressions?

User Mittmemo
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Answer:

It is necessary to look for the least common denominator when one is trying to add or subtract rational expressions that do not have the same denominator.

Explanation:

for example the denominator of the two addends are not the same. One has (x+2), the other (x-2).

User Amrita Stha
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