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x2 - (-3/2)x + 5/2 = 0
x2 +3/2x + 5/2 = 0
2x2 + 3x + 5 = 0
Sedangfkan pers. kuadrat yg akar2 nya -5 dan 9 adalah
x2 + (-5 + 9)x + -5. 9 = 0
x2 + 4x - 45 = 0