ja

English

Español

Português

Français

Deutsch

Italiano

Русский

中文(简体)

한국어

日本語

Tiếng Việt

עברית

العربية

人気のある代数 >

5x^2-4x-8=0

解

5 x^{2} - 4 x - 8 = 0

解

x = \frac{2 ( 1 + 11 )}{5}, x = \frac{2 ( 1 - 11 )}{5}

+1

十進法表記

x = 1.72664 \dots, x = - 0.92664 \dots

解答ステップ

5 x^{2} - 4 x - 8 = 0

解くとthe二次式

x_{1, 2} = \frac{- ( - 4 ) \pm ( - 4 ) ^{2} - 4 \cdot 5 ( - 8 )}{2 \cdot 5}

(- 4)^{2} - 4 \cdot 5 (- 8) = 411

x_{1, 2} = \frac{- ( - 4 ) \pm 4 11}{2 \cdot 5}

解を分離する

x_{1} = \frac{- ( - 4 ) + 4 11}{2 \cdot 5}, x_{2} = \frac{- ( - 4 ) - 4 11}{2 \cdot 5}

x = \frac{- ( - 4 ) + 4 11}{2 \cdot 5} : \frac{2 ( 1 + 11 )}{5}

x = \frac{- ( - 4 ) - 4 11}{2 \cdot 5} : \frac{2 ( 1 - 11 )}{5}

二次equationの解:

x = \frac{2 ( 1 + 11 )}{5}, x = \frac{2 ( 1 - 11 )}{5}

グラフ

人気の例

0.3x^2-1.2x-0.3=0

0.3 x^{2} - 1.2 x - 0.3 = 0

3/8 x^2+3x+24=0

\frac{3}{8} x^{2} + 3 x + 24 = 0

solvefor x,x^2y-x^2-y=0

so l v e f or x, x^{2} y - x^{2} - y = 0

4 x^{2} - 32 x + 8 = 12

5 x - x^{2} - x = 0