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Let roots be α and β
α = 6β 
now, if α and β are roots then equation will be (x -α)(x -β) =0
 (x -α)(x -β) =0
⇒ x² - (α+β)x + αβ =0 
now putting α = 6β ,
⇒x² - (6β +β)x + 6β×β =0
⇒x² - 7βx +6β² =0 
now comparing with  kx² -14x +8 =0
7β =14/k
⇒β =2/k
⇒β² = 4/k²_______(1)
and 6β² =8/k
⇒β² =4/3k_______(2)
equating (1) and (2), we get,
4/k² = 4/3k
k =3

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