Simplify the following expressions: 1. 2x2 + 2x2 2. 2x2 - 2x2

Here are the solutions to the problems from .9:

1. Simplify $2x^2 + 2x^2$

Step 1: Combine the like terms.

$$2x^2 + 2x^2 = (2+2)x^2$$ $$= 4x^2$$

The simplified expression is \boxed{\textbf{4x^2}}.

2. Simplify $2x^2 - 2x^2$

Step 1: Combine the like terms.

$$2x^2 - 2x^2 = (2-2)x^2$$ $$= 0x^2$$ $$$$