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人気のある代数 >

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

解

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

解

x = - \frac{- 5 + 41}{4}, x = \frac{5 + 41}{4}

+1

十進法表記

x = - 0.35078 \dots, x = 2.85078 \dots

解答ステップ

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

解くとthe二次式

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

5^{2} - 4 (- 2) \cdot 2 = 41

x_{1, 2} = \frac{- 5 \pm 41}{2 ( - 2 )}

解を分離する

x_{1} = \frac{- 5 + 41}{2 ( - 2 )}, x_{2} = \frac{- 5 - 41}{2 ( - 2 )}

x = \frac{- 5 + 41}{2 ( - 2 )} : - \frac{- 5 + 41}{4}

x = \frac{- 5 - 41}{2 ( - 2 )} : \frac{5 + 41}{4}

二次equationの解:

x = - \frac{- 5 + 41}{4}, x = \frac{5 + 41}{4}

グラフ

人気の例

11 x + 18 = x^{2}

(2x-13/4)^2= 121/16

(2 x - \frac{13}{4})^{2} = \frac{121}{16}

x^{2} + 30 = 25

solvefor x,29x^2-24xy+36y^2+82x-96y-91=0

so l v e f or x, 29 x^{2} - 24 x y + 36 y^{2} + 82 x - 96 y - 91 = 0

(x-3)(x-2)+5=9x+9

(x - 3) (x - 2) + 5 = 9 x + 9