1. 6.4 Addition, Subtraction, and more multiplication

2. Add and Subtract To add and subtract radical terms, they must have the same indices and same radicands. For example: -8 3 5 and 6 3 5 are like radical terms (or like radicals) because they have the same index and same radicand

3. 1) 2) 3) 4)

4. More examples 5)7 45 - 2 5 6)3 3 y 5 + 4 3 y 2 + 3 8y 6 7) 25x-25 - 9x-9 Answers: 5) 6) 7)

5. Multiply To multiply radical terms (indices have to be the same): just multiply radicands then simplify For example: 3 4 · 3 10 = = 3 40 = 3 8 ·5 = 2 3 5

6. 1) 2) 3)

7. 4) 5)

8. 6) Or rewrite as Then multiply