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sqrt(4x2) = ± 2x
The absolute value of 7± 5i = sqrt(72 + 52) = sqrt(49 + 25) = sqrt(74) = 8.602, approx.
(sqrt(6)-sqrt(2))/4
(1+sqrt(3))/(2 sqrt(2))
Yes, but it involves the square root of -1. sqrt (-X) = sqrt (X) * sqrt(-1)