Negative
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The square roots of 64 are +8 and -8.
Negative 64 is the square root of an integer. The square root of -64 is not an integer.
There is no real number multiplied by itself that equals -72, or any negative number, for that matter. In fact there are no even roots of negative numbers. However, odd roots of negative numbers are entirely possible. For instance, the cube root of -64 is -4 ... rather, ( -4 ) ( -4 ) ( -4 ) = -64
negative 64
The square root of 64 is +/- 8