Can you take the square root of a negative number?

NO!!!!

sqrt(-n) ?????

However,

-n X -n = (+)n^2

Sqrt(n^2) = either -n or (+)n , because either -n X -n = (+)n^2 or n x n = n^2

However,

sqrt(-n) takes us into IMAGINARY numbers.

sqrt(-n) = sqrt( -1 x n) = sqrt(-1) X sqrt(n)

.The sqrt(-1) is mathemtically unresolved and is given the symbol 'i' (small / lower case letter 'i'.

The sqrt(n) .being positive can be found.