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x1.2a=-b+VD
x1=-2
2a=2(k-1)
--->-4(k-1)=-4+V16+4k(k-1)
(-4k+8)^2=16+4k^2-4k
16k^2-64k+64=16+4k^2-4k
12k^2-60k-48=0
k^2-5k-6=0
(k-6)(k+1)=0
k=6 atau k=-1