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人気のある代数 >

-3x^2+5x+8=0

解

- 3 x^{2} + 5 x + 8 = 0

解

x = - 1, x = \frac{8}{3}

+1

十進法表記

x = - 1, x = 2.66666 \dots

解答ステップ

- 3 x^{2} + 5 x + 8 = 0

解くとthe二次式

x_{1, 2} = \frac{- 5 \pm 5 ^{2} - 4 ( - 3 ) \cdot 8}{2 ( - 3 )}

5^{2} - 4 (- 3) \cdot 8 = 11

x_{1, 2} = \frac{- 5 \pm 11}{2 ( - 3 )}

解を分離する

x_{1} = \frac{- 5 + 11}{2 ( - 3 )}, x_{2} = \frac{- 5 - 11}{2 ( - 3 )}

x = \frac{- 5 + 11}{2 ( - 3 )} : - 1

x = \frac{- 5 - 11}{2 ( - 3 )} : \frac{8}{3}

二次equationの解:

x = - 1, x = \frac{8}{3}

グラフ

人気の例

completesquare x^2+4x+29

co m pl e t es q u a re x^{2} + 4 x + 29

2 n^{2} + 9 n + 10 = 0

q^{2} = - 9

(x+1)^2= x/2 (5x+6)-(2x^2+1)

(x + 1)^{2} = \frac{x}{2} (5 x + 6) - (2 x^{2} + 1)

2x^2+5x+c^2+2c+1=0

2 x^{2} + 5 x + c^{2} + 2 c + 1 = 0