whats the square root of -7
This is an IMAGINARY NUMBER answer.
YOU CANNOT MULTIPLY ANY REAL NUMBER BY ITSELF AND GET A NEGATIVE ANSWER.
THAT IS IMPOSSIBLE!
A negative times a negaive = a positive !!
A positive times a positive = a positive !!
$${\sqrt{-{\mathtt{7}}}} = {\mathtt{2.645\: \!751\: \!311\: \!064\: \!590\: \!6}}{i}$$