Chapter 10 - Radical Expressions and Equations - 10-3 Operations With Radical Expressions - Practice and Problem-Solving Exercises - Page 629: 13

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You are given 3$\sqrt 7$- $\sqrt 63$.When you simplify $\sqrt 63$ you get 3$\sqrt 7$.You have 3$\sqrt 7$-3$\sqrt 7$ and you can solve now: 3$\sqrt 7$-3$\sqrt 7$ -use distributive property to simplify similar elements- $\sqrt 7$(3-3) -simplify- 0$\sqrt 7$ =0