# Value of roots

Algebra Level 3

If $$\alpha , \beta$$ be the roots of $$x^{2} -a(x - 1) + b = 0$$, then the value of $$\frac{1}{ (\alpha)^{2} - a\alpha } + \frac{1}{ (\beta)^{2} - a\beta } + \frac{2}{a + b}$$ is

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