Question

sqrt(-a) * sqrt(-b)=?

Answer 1

multiplying is all your doing so...

\[\sqrt{-a}*\sqrt{-b} = \sqrt{ab}\]

Answer 2

is it √ab or -√ab?

Answer 3

quite simply, two negatives multiplied together give you a positive

Answer 4

√(-a)=i√a and √(-b)=i√b, multiplying this results -√ab

Answer 5

agreed mhasan

Answer 6

You are absolutely right. I always forget about i

Answer 7

thanks @jimmyrep