Odpowiedź :
-x2+5x+6=0
Δ= (5)2 - 4 * (-1)*6= 25 + 24= 49
√Δ= √49 =7
x1= -5- 7/ -2= -12/-2=6
x2= -5+7/-2= 2/-2=-1
-x2+2x+3=0
delta = 4 + 12 = 16
√delta =√16= 4
x1= -2+4/-2= 2/-2=-1
x2= -2-4/-2= 3
-x2+5x+6=0
Δ= (5)2 - 4 * (-1)*6= 25 + 24= 49
√Δ= √49 =7
x1= -5- 7/ -2= -12/-2=6
x2= -5+7/-2= 2/-2=-1
-x2+2x+3=0
delta = 4 + 12 = 16
√delta =√16= 4
x1= -2+4/-2= 2/-2=-1
x2= -2-4/-2= 3