x^2 -mx-2x+m=0
x^2 -(m+2)x+m=0
yuze quadratik equashun tu get roots:
-b/2a be +(m+2)/2
+-sqrt[(m+2)^2 -4m]
Tu get reel anser, (m+2)^2 gotta be > 4m so take square root av + number
true...min at m=-2...square=0 but -4m=+8,so sqrt av +
if m> 0 (m+2)^2 > -4m, so get sqrt(+)