Verified answer

Объяснение:

11

[tex]3 {x}^{2} - 8x - 3 = 0 \\ d = ( { - 8)}^{2} - 4 \times ( - 3) \times 3 = 64 + 36 = 100 = {10}^{2} \\ x = \frac{8 - 10}{6} = \frac{ - 2}{6} = - \frac{1 }{3 } \\ x = \frac{8 + 10}{6} = \frac{18}{6} = 3[/tex]