Because both 82 and (-8)2 equal 64.
So both 8 and -8 could be square roots of 64.
When solving equations involves taking a square root, you need to be alert to the possibilty that there may be multiple answers.
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Negative 64 is the square root of an integer. The square root of -64 is not an integer.
The square root of 64 equals 8. 8x8=64
The square root of 64 is ± 8
the square root of 64 is 8
The square root of 64 is 8(8 x 8 = 64)