What is the square root of -1?

Answer 1

The square root of -1 is usually marked as undefined. however if you would like to go through or past Algebra 2 then the answer would be i, or imaginary. There is no definite answer in the realm of real numbers so the answer comes to be imaginary. So if you see a t-shirt, or flair button on facebook, that starts with the "square root of negative one" symbol followed by a heart - it symbolizes: "I Love...".
i, an imaginary number.

Answer 2

still 1
The square root of 1 is plus or minus 1. √1 = ± 1 The reason is that 12 = 1 and -12 = 1. (Either 1 squared or minus 1 squared equals one.)

Answer 3

The square root of 1 is also 1, so then you just take the square root of that, which is, again, 1.

Answer 4

' 1 ' actually has two different square roots. They are +1 and -1.

Answer 5

It is I

Answer 6

1