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 $\_\_\_\_$ . - Math Practice Question | 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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