Q.

If α,β2  are roots of  5x220x+3k=0 and β,α2  are roots of  kx250x+45=0
(a, b,  α,βR and k0,α>β ), then which of the following option(s) is/are correct?
 

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a

αβ=3

b

α310α+3β=0

c

β34β+α=0

d

k=5

answer is A, B, C, D.

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Detailed Solution

 α+β2=4,αβ2=3k5,βα2=45Kandβ+α2=50kα3β3=27,αβ=3
 α=3,β=1andk=5
Since,   is root of  5x220x+3k=0
 β44β2+3=0
 β34β+3β=0orβ34β+α=0
 α410α2+9=0α310α+3β=0

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