4i
square root of 16 is 4, but negative square roots aren't real so the i means its imaginary.
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-sqrt(48/3) = -sqrt(16) = -4 Technically, sqrt(16) = +4 or -4 so -sqrt(16) = -4 or +4
-3*sqrt(48) = -3*sqrt(16*3) = -3*sqrt(16)*sqrt(3) = -3*4*sqrt(3) = -12*sqrt(3)
-16+(-10) = -26
There are no 'real' numbers that can do that. The numbers are 3 + j sqrt(3) and 3 - j sqrt(3). ( ' j ' is the square root of negative 1 )
sqrt(160) = sqrt(16*10) = sqrt(16)*sqrt(10) = 4*sqrt(10)