if a function $f(x)= 5x³-15x-a$ has three distinct and real roots for $a € ( \alpha,\beta)$ then find $\beta-2(\alpha)$

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if a function \(f(x)= 5x³-15x-a\) has three distinct and real roots for \(a € ( \alpha,\beta)\) then find \(\beta-2(\alp…