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人気のある代数 >

9x^2+8x-4=0

解

9 x^{2} + 8 x - 4 = 0

解

x = \frac{2 ( 13 - 2 )}{9}, x = - \frac{2 ( 2 + 13 )}{9}

+1

十進法表記

x = 0.35678 \dots, x = - 1.24567 \dots

解答ステップ

9 x^{2} + 8 x - 4 = 0

解くとthe二次式

x_{1, 2} = \frac{- 8 \pm 8 ^{2} - 4 \cdot 9 ( - 4 )}{2 \cdot 9}

8^{2} - 4 \cdot 9 (- 4) = 413

x_{1, 2} = \frac{- 8 \pm 4 13}{2 \cdot 9}

解を分離する

x_{1} = \frac{- 8 + 4 13}{2 \cdot 9}, x_{2} = \frac{- 8 - 4 13}{2 \cdot 9}

x = \frac{- 8 + 4 13}{2 \cdot 9} : \frac{2 ( 13 - 2 )}{9}

x = \frac{- 8 - 4 13}{2 \cdot 9} : - \frac{2 ( 2 + 13 )}{9}

二次equationの解:

x = \frac{2 ( 13 - 2 )}{9}, x = - \frac{2 ( 2 + 13 )}{9}

グラフ

人気の例

x^{2} + 13 x - 10 = 0

solvefor x,f=x^2y^2z^2

so l v e f or x, f = x^{2} y^{2} z^{2}

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

x (x + 3) = 54

12 b^{2} - 27 = 0