but basically, you try to avoid squaring negatives, since you need to use that little i there to correct it but if you want the square root of 2.557 negative, then the question would be -|2.557| i think
If you put -2.557 squared into a calculator, it will think you mean -(2.557squared) That is because it treats -2.557squared as -1*2.557squared and powers are always done before multiply.
