# A slightly different SBI contest results #1

### 8 comments

The problem of the last contest was:

`x² = -1`

The solution to this is not to hard, although it is still often teached in school that this has no solution:

`x² = -1 | √`

↓

`x = √-1`

And that's mostly it. Now you just need to know that `i`

is defined as:

`i = √-1`

↓

`x = i`

There also are 2 other possible solutions which would need knowledge about quaternions(the 4d version of complex number with `i`

, `j`

and `k`

):

`x = j`

and `x = k`

The last two solutions are less popular and no one got that.

The first solution was chosen correctly by 2 people:

@heraclio and @ajayyy

So I put their names into a self-written random selector:

Congratulations @heraclio . You won one SBI:

The next contest will start tomorrow and will be *slightly different*.

## Comments