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人気のある代数 >

9x^2-30x-25=0

解

9 x^{2} - 30 x - 25 = 0

解

x = \frac{5 ( 1 + 2 )}{3}, x = \frac{5 ( 1 - 2 )}{3}

+1

十進法表記

x = 4.02368 \dots, x = - 0.69035 \dots

解答ステップ

9 x^{2} - 30 x - 25 = 0

解くとthe二次式

x_{1, 2} = \frac{- ( - 30 ) \pm ( - 30 ) ^{2} - 4 \cdot 9 ( - 25 )}{2 \cdot 9}

(- 30)^{2} - 4 \cdot 9 (- 25) = 302

x_{1, 2} = \frac{- ( - 30 ) \pm 30 2}{2 \cdot 9}

解を分離する

x_{1} = \frac{- ( - 30 ) + 30 2}{2 \cdot 9}, x_{2} = \frac{- ( - 30 ) - 30 2}{2 \cdot 9}

x = \frac{- ( - 30 ) + 30 2}{2 \cdot 9} : \frac{5 ( 1 + 2 )}{3}

x = \frac{- ( - 30 ) - 30 2}{2 \cdot 9} : \frac{5 ( 1 - 2 )}{3}

二次equationの解:

x = \frac{5 ( 1 + 2 )}{3}, x = \frac{5 ( 1 - 2 )}{3}

グラフ

人気の例

9 x^{2} - 8 x = 0

4 x^{2} + 8 x + 80 = 0

(2 D - 1)^{2} = 0

14 = x^{2} + 5 x

(x+9)^2=x^2+(x+1)^2

(x + 9)^{2} = x^{2} + (x + 1)^{2}