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= (-b/a) (√D/a)
= (-(-6)/2) (√b² - 4ac/a)
= 3(√36 - 4.2.(2k+1)/a)
= 3(√36 - 16k - 8/2)
3(√28 - 16k/2) = 6
(√28 - 16k/2) = 2
√28 - 16k = 4
28 - 16k = 16
12 = 16k
k = 12/16 = 3/4 = 0,75