### Home > CC3 > Chapter 2 > Lesson 2.1.8 > Problem 2-78

2-78.

Simplify each expression below as much as possible.

Try using an Expression Mat.

Combine like terms.

Remember to remove unnecessary signs.

(Example:would be )

Follow the steps described in part (a).

Remember you cannot combine variables with different exponent values. (Example: you cannot add

)