Utilisez la formule quadratique : \(x = \frac-b \pm \sqrtb^2 - 4ac2a = \frac-2 \pm \sqrt4 + 442 = \frac-2 \pm \sqrt482 = \frac-2 \pm 4\sqrt32 = -1 \pm 2\sqrt3\). - go-checkin.com