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a=1, b=-6, c=-12
Faktor dari persamaan tersebut yg kurang dari 0:
x=(-b-(b^2-4ac)^0,5)/2a
x= (6-(6^2-4(1)(-12))^0,5)/2(1)
x=(6-(36+48)^0,5)/2
x=(6-(84)^0,5)/2
x=(6-2(21)^0,5)/2
x=3-(21)^0,5