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a = 3, b = -4, c = 2
⇒
α + β
= -b / a
= (-(-4)) / 3
= 4/3
⇒
α.β
= c / a
= 2/3
a.
(α + β)² - 2αβ
= (4/3)² - 2(2/3)
= 16/9 - 4/3
= 4/9
b.
(α + β)² . αβ
= (4/3)² . 2/3
= 16/9 . 2/3
= 32/27