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pake rumus abc
X1,2=-b+-(√b²-4ac)/2a
=-2+(√2²-4.3.-8)/2.3 dan -2+(√2²-4.3.-8)/2.3
=(-2+10)/6 dan (-2-10)/6
x1=4/3 dan x2=-2
jadi faktorx
((3x-4)(x+2))