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x1 . x2 = c/a = -3/2
misal A = 4x1
B = 4x2
A+B = 4x1 + 4x2
= 4(x1+x2)
= 4 . 1/2 = 2
A.B = 4x1 . 4x2
= 4(x1 . x2)
= 4 . -3/2 = -6
Persamaan kuadrat baru x^2 - 2x + 6