Question

Determine o valor numérico da expressão 3ײ -5×-1

Answer 1

$\large\bm{ {3x}^{2} - 5x - 1} \\ \large\bm{3 {x}^{2} - 5x - 1 = 0 } \\ \\ \large\bm{\begin{cases}a = 3 \\ b = - 5 \\ c = - 1\end{cases}} \\ \\\large\bm{x = \dfrac { - \left( - 5\right) \pm \: \sqrt{\left( - 5\right)^{2} } - 4 \times 3 \times\left( - 1\right) }{2 \times 3} } \ \\ \\ \\ \large\bm{x = \dfrac{5 \pm \sqrt{25 + 12} }{6} } \\ \\ \\ \large\bm{x = \dfrac{5 \pm \sqrt{37} }{6} } \\ \\ \\ \large\bm{x = \dfrac{5 + \sqrt{37} }{6} } \\ \\ \\ \large\bm{x = \dfrac{5 - \sqrt{37} }{6} } \\ \\ \\ \bm{\large\boxed{\boxed{  { \large \bm{ x_{1} = \dfrac{5 + \sqrt{37} }{6} }}}}} \\ \bm{\large\boxed{\boxed{  { \large \bm{ x_{2} = \dfrac{5 - \sqrt{37} }{6} }}}}}$

${\large\boxed{\boxed{  { \large \bm{ Bons~Estudos} }}}}$