# Math Help - which step is wrong

1. ## which step is wrong

sqrt(-1/1)=sqrt(1/-1)
sqrt(-1)*sqrt(-1)=sqrt(1)*sqrt(1)
i*i=1
i2=1
but as per definition i2 = -1.

please tell me which step is wrong.

2. ## Re: which step is wrong

Originally Posted by deepak
sqrt(-1/1)=sqrt(1/-1)
sqrt(-1)*sqrt(-1)=sqrt(1)*sqrt(1)
i*i=1
i2=1
but as per definition i2 = -1.

please tell me which step is wrong.

The very first. $\sqrt{\frac{-1}{1}}$ does not exist.