If you use a guess and check method, you see that 7² = 49 and 9² = 81.
Since 49 < 64 < 81 the next logical step would be checking 8².

8² = 8 x 8
8² = 64 <--- We match our original number!!!
Therefore, √64 = ±8

The principal root is the positive square root, so we have a principal root of 8

Answer

↓Steps Explained:↓

Evaluate the following

√64

Term 1 has a square root, so we evaluate and simplify:

Group constants

8 = 8

Final Answer:

8

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