[latex]14 x^{2} + x-3=0[/latex]

14x^2+x-3=0 D = b²-4ac = 1²-4*14(-3) = 1+168 = 169 = 13² [latex]x_{1} = \frac{-b+ \sqrt{D} }{2a} = \frac{-1+13}{2*14} = \frac{12}{28} = \frac{3}{7} [/latex][latex]x_{2} = \frac{-b- \sqrt{D} }{2a} = \frac{-1-13}{2*14} = -\frac{14}{28} = - \frac{1}{2} = - 0.5[/latex]