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= 2 (x1+x2)
= 2 (3) = 6
x1.x2 = 2x1 . 2x2
= 4 (x1.x2)
= 4 (1) = 4
persamaan kuadrat baru:
x2 - (x1+x2)x + x1.x2 = 0
--> x2 - 6x + 4 = 0