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Solve the equation 24x^3-14x^2-63x + al...

Solve the equation `24x^3-14x^2-63x + alpha= 0`, one root being double of another. Hence find the vulue(s) of `lambda`.

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A DAS GUPTA-Equations, Inequation and Expressions-Exercise
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  3. Solve the equation 24x^3-14x^2-63x + alpha= 0, one root being double ...

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