Question

Can some one explain me what is an imaginary number when working with radical expressions?

Answer 1

√(-1) is when you first come across imaginary numbers
"Simply" put √(-1) is defined to be i

Answer 2

I'm lost

Answer 3

√(-1) = x means that if you square x you should get -1, the problem with that is that any number squared is positive (remembering that to square a number you multiply by itself). Mathematicians got around this problem by "inventing" a new number i and defined i to be equal to √(-1)

Answer 4

ok