PolynomialAndEquation VietaTheorem Basic

Problem - 2594
Let $\alpha$ and $\beta$ be the two roots of $x^2 + 2x -5=0$. Evaluate $\alpha^2 + \alpha\beta + 2\alpha$.

By Vieta's theorem, we have $$\alpha^2 + \alpha\beta + 2\alpha = \alpha(\alpha + \beta) + 2\alpha=-2\alpha+2\alpha=\boxed{0}$$

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