MAT 219 Week 6 participation Simplifying an Expression

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MAT 219 Week 6 participation Simplifying an Expression
MAT 219 Week 6 participation Simplifying an Expression
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MAT 219 Week 6 participation Simplifying an Expression

When you simplify a rational expression, why are the numerator and the denominator factored? Why do you need a least common denominator when adding and subtracting rational expressions?