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To add (or subtract) two or more rational expressions with the same denominators, add (or subtract) the numerators and place the result over the denominator.
If , , and represent polynomials (with ), then
and
.
Example 1:
Add .
Since the denominators are the same, just add the numerators.
Example 2:
Subtract .
Since the denominators are the same, just subtract the numerators.