or in correct mathematical notation it is (+,-)
i_square root(9)
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Plus or minus 3i.
4 x square root of 10 minus square root of 10 = 3 x square root of 10.
The square root of -4 is: 2 i
sqrt(25) - 9 = 5 - 9 = -4sqrt(25 - 9) = sqrt(16) = +4 and -4
well, the square root of 81 is 9, and seven squared is 49, so it wud be 40