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alpha+beta=alpha×beta/2
where alpha+beta= -b/a=k+6
alpha×beta=c/a=4k-2
so,
k+6=4k-2/2
k+6=2k-1
-3k=-7
k=7/3
where alpha+beta= -b/a=k+6
alpha×beta=c/a=4k-2
so,
k+6=4k-2/2
k+6=2k-1
-3k=-7
k=7/3
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