1.D=49-4*(-10)=9
X1=(-7+9)/2=-1
X2=(-7-9)/2=8
2.D=16-4*4=0
X1=(-4+0)/2=-2
3.D=36-4*(-16)=100
X1=(6+10)/2=8
X2=(6-10)/2=-2
4.D=4-4*(-15)=64
X1=(-2+8)=3
X2=(-2-8)=-5
5.D=49-4*6=25
X1=(5+7)/12=1
X2=(5-7)/12=-1/6
6.D=81-4*7*2=25
X1=(-9+5)/14=-2/7
X2=(-9-5)/14=-1