If you have a square root of a number, that means that your "square root" squared (multiplied by itself) will give you your original number. For example: * The square root of 4 is 2. * 2 x 2 is 4.
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Square root 64 and square root 81
The square root of 36 and the square root of 49.
+6.5 and -6.5, possibly.
Square root of 64 and square root of 81, perhaps.
The answer is 2i. When dealing with negative square roots, the expression i is used to represent the square root of -1.