why does 3square root 2 = square root 72 ?

Holt Mcdougal Larson Pre-algebra: Student Edition 2012
1st Edition
ISBN:9780547587776
Author:HOLT MCDOUGAL
Publisher:HOLT MCDOUGAL
Chapter9: Real Numbers And Right Triangles
Section9.1: Square Roots
Problem 2E
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why does 3square root 2 = square root 72 ?

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