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x1x2 = -1
(2x1 -3) + (2x2-3) = 2(x1+x2) -6 = 2(-4) -6 = -8-6=-14
(2x1-3)(2x2-3) = 4x1x2-6x1-6x2+9 = 4(x1x2)-6(x1+x2)+9= 4(-1)-6(-4)+9 = -4+24+9=29
Persamaan kuadrat baru
x^2 + 14x + 29= 0 (A)