D=b²-4ac= (-3)²-4*(-4)*1=9+16=25
x1=(-b+√D)/2a=(-(-3)+√25)/2=(3+5)/2=4
x1=(-b+√D)/2a=(-(-3)-√25)/2=(3-5)/2=-1
D=b²-4ac= (-3)²-4*(-4)*1=9+16=25
x1=(-b+√D)/2a=(-(-3)+√25)/2=(3+5)/2=4
x1=(-b+√D)/2a=(-(-3)-√25)/2=(3-5)/2=-1