-4x^2-12x-9=0

解

- 4 x^{2} - 12 x - 9 = 0

x = - \frac{3}{2}

十進法表記

x = - 1.5

解答ステップ

- 4 x^{2} - 12 x - 9 = 0

解くとthe二次式

x_{1, 2} = \frac{- ( - 12 ) \pm ( - 12 ) ^{2} - 4 ( - 4 ) ( - 9 )}{2 ( - 4 )}

(- 12)^{2} - 4 (- 4) (- 9) = 0

x_{1, 2} = \frac{- ( - 12 ) \pm 0}{2 ( - 4 )}

x = \frac{- ( - 12 )}{2 ( - 4 )}

\frac{- ( - 12 )}{2 ( - 4 )} = - \frac{3}{2}

x = - \frac{3}{2}

二次equationの解:

x = - \frac{3}{2}