Jawabanmu

2014-03-27T14:00:52+07:00
4ײ + 8× -12= 0 
a= 4    b= 8   c=-12

(
α+β) = -b/a = -8/4 = -2
αβ = c/a = -12/4 = -3

α²+β² = (α+β)²-2αβ
          = (-2)² - 2(-3)
          = 4-(-6)
          = 4+6
          = 10