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x1.2=[-12±√(12²-4.1.32)]/(2.1)
x1.2=[-12±√(144-128)]/2
x1.2=[-12±√16]/2
x1.2=[-12±4]/2
x1=(-12+4)/2=-8/2=-4
x2=(-12-4)/2=-16/2=-8