What is the square root of -1?

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  i

Step-by-step explanation:

The square root of -1 is the number that, when multiplied by itself, gives the product -1. It does not have a numerical value in the same way that the root of a positive number has a numerical value. It can only be represented by a symbol of some sort: √(-1) or i.

  i² = -1

In some fields, the letter j is used instead (because i already stands for something different).

  i = √(-1)

  j = √(-1) . . . in electrical engineering (at least)

i think it would be 42cm

ok then what happened.