x^2-6x-16=0
D=36-4*1*-16 =36+64=V100=10
x1=6+10/2=8
x2=6-10/2=-2
x2-6x-16=0
D=(-6)^2-4*1*(-16)
D=36+64
D=100
x^2-6x-16=0
D=36-4*1*-16 =36+64=V100=10
x1=6+10/2=8
x2=6-10/2=-2
x2-6x-16=0
D=(-6)^2-4*1*(-16)
D=36+64
D=100