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If the roots of the equation px^2+qx+r=0...

If the roots of the equation `px^2+qx+r=0` where `2p, q, 2r` are in G.P., are of the form `alpha^2, 4alpha-4` Then the value of `2p+4q+7r` is

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`px^2+qx+r=0-(A)`
`2p,q,2r`
`2p=a`
`q=as`
`2r=as^2`
`q^2=4pr`
`alpha^2+4alpha-4=-q/p`
`(-as)/a*2=1-2s`
...
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