Answer
Because both 6$\sqrt 3$ and 2$\sqrt 3$ have $\sqrt 3$.
Work Step by Step
The part of both 6$\sqrt 3$ and 2$\sqrt 3$ that is the same is $\sqrt 3$. Since these radicals share a part that is the same, that makes them "like radicals."
Algebra 1: Common Core (15th Edition)
by Charles, Randall I.
Published by
Prentice Hall
ISBN 10:
0133281140
ISBN 13:
978-0-13328-114-9
Chapter 10 - Radical Expressions and Equations - Get Ready! - Page 611: 21
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