The square root of negative numbers is either "not allowed" (Case 1) or it results in imaginary roots (Case 2).
-8+ square root of -20 /24 "not allowed," Case 1
-8+ square root of -5/6 = -8 plus or minus i times sqrt(5/6)
5√6
= -8 plus or minus i times --------- (Case 2)
6
