If the set of all values of a , for which the equation 5 x^3-15 x-a=0 has three distinct real roots, is the interval (\alpha, \beta), then \beta-2 \alpha is equal to.: (Mathematics) Question | DivineJEE | DivineJEE

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If the set of all values of a , for which the equation

5 x^3-15 x-a=0

has three distinct real roots, is the interval

(\alpha, \beta)

, then

\beta-2 \alpha

is equal to

\_\_\_\_

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