-9x^2-6x-1=0

解

- 9 x^{2} - 6 x - 1 = 0

x = - \frac{1}{3}

十進法表記

x = - 0.33333 \dots

解答ステップ

- 9 x^{2} - 6 x - 1 = 0

解くとthe二次式

x_{1, 2} = \frac{- ( - 6 ) \pm ( - 6 ) ^{2} - 4 ( - 9 ) ( - 1 )}{2 ( - 9 )}

(- 6)^{2} - 4 (- 9) (- 1) = 0

x_{1, 2} = \frac{- ( - 6 ) \pm 0}{2 ( - 9 )}

x = \frac{- ( - 6 )}{2 ( - 9 )}

\frac{- ( - 6 )}{2 ( - 9 )} = - \frac{1}{3}

x = - \frac{1}{3}

二次equationの解:

x = - \frac{1}{3}