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b = -1
c = 2
akar-akarnya adalah A dan B
A+B = -b/a
AB = c/a
(A+B)²-AB = (-b/a)²-c/a
= (1/3)²-2/3
= 1/9-2/3
= 1/9 - 6/9
= -5/9
px^2+qx+r=0
p=3, q=-1, r=2
(a+b)^2-ab=(-q/p)^2 -(r/p)
=(-(-1/3))^2 - (2/3)
=1/9 - 2/3
=-5/9