Negative number
The root of a negative number has no real value. However, you can perform calculations.
Example 1
You may not multiply roots of negative numbers directly and so the calculation
is wrong. You must use the imaginary unit, that is defined by i2 = –1 and then you get
You probably did not expect that.
Example 2
The division of two negative roots
gives a positive number, but you probably wouldn't have expected anything else.