2.25
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*Edit: As for the -6 - it can be this too but if you're not that good at square roots just now then I was assuming that you hadn't 'got that far' yet, so there was no need to worry about it.
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The square root of -81 = 9 i9i
The square root of 81 is 9
The square root of 6561 is 81
The square root of 81 squared is 81.