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a=2, b=6 ,c=3
x1+x2 = -b/a
= -6/2= -3
x1×x2 = c/a
= 3/2
pers kuadrat
x²-(x1+x2)x+(x1×x2)=0
x²-(-3)x+3/2=0
x²+3x-3/2=0
------------------ ×2
2x²+6x-3=0