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Pakai rumus abc
[-b+/-(b^2-4ac)^1/2]/2a
[2+/-(4-(-120)^1/2]/2.3
[2+/-(124)1/2]/6
[2+/-2(31^1/2)]/6
x1=[1+(31^1/2)]/3
x2=[1-(31^1/2)]/3