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1.Cara melengkapkan kuadrat sempurna
x^2-12x+6=0
(x-6)^2-36+6=0
(x-6)^2=36-6
(x-6)^2=30
(x-6)=+-√30
x=+-√30+6
x1=√30+6
=6+√30
x2=-√30+6
=6-√30
2.cara Rumus ABC:
x=-b+-√b^2-4ac/2a
=-(-12)+-√-12^2-4.1.6/2.1
=12+-√144-24/2
=12+-√120/2
=12+-√4x30/2
=12+-2√30/2
x1=12+2√30/2
=6+√30
x2=12-2√30/2
=6-√30
Demikian semoga membantu dan bermanfaat!