Exercise 3 Page 489

The first step in simplifying this expression is to identify which, if any, terms can be combined. Remember, only like terms — constant terms or terms with the same variable — can be combined. ( 5r^3 + 8)+( 6r^3 + 3) In this case, we have two r^3-terms and two costants. Only the r^3-terms and costant-terms can be combined, so to simplify the expression we will remove the parentheses and rearrange it according to the Commutative Property of Addition, and then combine like terms.

(5r^3+8)+(6r^3+3)

RemovePar

Remove parentheses

5r^3+8+6r^3+3

CommutativePropAdd

Commutative Property of Addition

5r^3+6r^3+8+3

AddTerms

Add terms

11r^3+11