### Home > INT3 > Chapter 12 > Lesson 12.1.1 > Problem 12-9

12-9.

Some of the following rational expressions have common denominators and some do not. Add or subtract the expressions and, if possible, simplify. Homework Help ✎

See part (a).

Try factoring after subtracting.

Factor to find the common denominator, then use the strategy from part (a) to simplify.

check the step where you subtracted.

−(x − 3) = x + 3