VietaTheorem Basic

Problem - 2599
Let $x_1$ and $x_2$ be the two roots of $2x^2 -7x -4=0$, compute the values of the following expressions using as many different ways as possible. (1) $x_1^2 + x_2^2$ (2) $(x_1+1)(x_2+1)$ (3) $\mid x_1 - x_2 \mid$

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