Question

3x²-2x-1=0 equação do 2 grau ​

Answer 1

Resposta:

$3 {x}^{2} - 2x - 1 = 0 \\ x =\frac{ - b \sqrt[ + - ]{ {b}^{2} - 4ac } }{2a} \\ x = \frac{ - ( - 2) \sqrt[ + - ]{ {2}^{2} - 4 \times 3 \times ( - 1) } }{2 \times 3}$

$x = \frac{2 \sqrt[ + - ]{4 + 12} }{6} \\ x = \frac{2 \sqrt[ + - ]{16} }{6} \\ x = \frac{2 + - 4}{6}$

${x}^{1} = \frac{2 + 4}{6} = \frac{6}{6} =1 \\ {x}^{2} = \frac{2 - 4}{6} = \frac{ - 2}{6} \frac{ \div 3}{ \div 3} = \frac{ - 1}{2}$