ax²+bx+c=0
D=b²-4ac
x1=-b+√D / 2a
x2=-b-√D /2a
x²-6x+4=0
D=6²-4×1×4=20
x1= 6+2√5 / 2 = 2×(3+√5) / 2 = 3+√5
x2= 6-2√5 / 2 = 2×(3-√5) / 2 = 3-√5
x²+px+q=0
x1+x2=-p
x1×x2=q
x1+x2= 3+√5 + 3-√5 = 6
x1×x2= (3+√5) (3-√5) = 4
ax²+bx+c=0
D=b²-4ac
x1=-b+√D / 2a
x2=-b-√D /2a
x²-6x+4=0
D=6²-4×1×4=20
x1= 6+2√5 / 2 = 2×(3+√5) / 2 = 3+√5
x2= 6-2√5 / 2 = 2×(3-√5) / 2 = 3-√5
x²+px+q=0
x1+x2=-p
x1×x2=q
x1+x2= 3+√5 + 3-√5 = 6
x1×x2= (3+√5) (3-√5) = 4