Find a least common denominator


Find a least common denominator

We add or subtract rational expressions with different denominators by first writing them with a common denominator, usually the least common denominator (LCD).


Finding the Least Common Denominator


Step 1 Factor each denominator.


Step 2 Find the least common denominator. The LCD is the product of all different factors from each denominator, with each factor raised to the greatest power that occurs in any denominator.

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