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imajiner karena D < 0
x1 = (-3 + √(9-4.5.4))/2.(10)
= (-3 + √(-71))/20
= (i.√71 - 3)/20
x2 = (-3 - √(9-4.5.4))/2.(10)
= (-3 - √(-71))/20
= (-3 - i.√71)/20