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x1+x2=-b/a=-(3/1)=-3
x1x2=c/a=-4/1=-4
x1+x2
(x1+3)(x2+3)
x1+x2+6
-3+6
3
x1x2
(x1+3)(x2+3)
x1x2+3(x1+x2)+9
-4+3(-3)+9
-4
PK baru
x²-(x1+x2)x+x1x2=0
x²-(3)x + (-4)=0
x²-3x-4=0