Ononot — A quadratic x^2 + bx + 6 = 0 has roots r and s such that r^2

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Equations & Systemsmedium

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A quadratic $x^2 + bx + 6 = 0$ has roots $r$ and $s$ such that $r^2 + s^2 = 13$ . What are the possible values of $b$ ?