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x1 + x2 = 7/2
x1.x2 = 4/2 = 2
(2x1 -3) + (2x2 - 3) = 2 (x1 + x2) - 6
= 2 (7/2) - 6
= 7 - 6
= 1
(2x1 - 3)(2x2 - 3) = 4.x1.x2 - 6x1 - 6x2 + 9
= 4.x1.x2 - 6(x1 + x2) + 9
= 4(2) - 6(7/2) + 9
= 8 - 21 + 9
= -4
persamaan baru
x^2 - x - 4 = 0