(October 27, 2016 at 3:39 am)Irrational Wrote:(October 27, 2016 at 3:05 am)Alex K Wrote: 1=sqrt(1)=sqrt(-1 * -1)=sqrt(-1)*sqrt(-1)= i*i=-1
Ah, yeah, I remember something about the rule: no splitting the radicals when both factors are negative. Is that correct?
I want to know why actually.
Is it because of the product of two negative numbers being positive?