Question 1014800
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Expressed in simplest form 2 radical negative 50 times 3 radical negative 8 is equivalent to 
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{{{2*sqrt(-50)}}}.{{{3*sqrt(-8)}}} = {{{2*3*sqrt((-50)*(-8))}}} = {{{6*sqrt(400)}}} = +/- {{{ 6*20}}} = +/- 120.


Taking the square root in the complex domain is many-valued operation (more exactly, two-valued operation). 
It means that two values of the square root that differ only by sign are equally right.
I marked it by putting the signs +/-.
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