Răspuns :
-x^2 +2x+3=0
delta=b^-4ac
delta=4-4*(-1)*3
delta=4+12
delta=16
rad din delta=4
x1=-b-rad delta/ 2a
x1=-2-4/(-2)
x1=-6/-2
x1=3
x2=-b+rad delta/ 2a
x1=-2+4/(-2)
x1=2/-2
x1=-1
delta=b^-4ac
delta=4-4*(-1)*3
delta=4+12
delta=16
rad din delta=4
x1=-b-rad delta/ 2a
x1=-2-4/(-2)
x1=-6/-2
x1=3
x2=-b+rad delta/ 2a
x1=-2+4/(-2)
x1=2/-2
x1=-1