### Home > CC4 > Chapter A > Lesson A.1.2 > ProblemA-21

A-21.

For each expression below, first indicate how many terms it contains. Then copy and simplify each expression by combining like terms. Algebra tiles may be helpful. Homework Help ✎

1. 2x − 3x − 3 + 4x2 + 10 + x

2. −4x + y2 − 9 + 10 − x + 3x − 4y2

3. 2x2 + 30y + 3x2 + 4x2yx

4. 0 − 20 − 5xy + 4y2 + 10 − y + xy

4x2 + (2x − 3x + x) + (10 − 3)

4x2 + 7

It may helpful to rearrange the terms so that all like terms are next to one another before simplifying.