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If the product of the roots 4x^(3)+16x^(...

If the product of the roots `4x^(3)+16x^(2)-9x-a=0` is 9 then find a

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`alpha ,beta, gamma ` are the roots of
`4x^3+16x^2-9xa=0`
`alpha ,beta, gamma = a/4 =9 rArr a =36`
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