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人気のある代数 >

-2x^2+8x-7=0

解

- 2 x^{2} + 8 x - 7 = 0

解

x = \frac{4 - 2}{2}, x = \frac{4 + 2}{2}

+1

十進法表記

x = 1.29289 \dots, x = 2.70710 \dots

解答ステップ

- 2 x^{2} + 8 x - 7 = 0

解くとthe二次式

x_{1, 2} = \frac{- 8 \pm 8 ^{2} - 4 ( - 2 ) ( - 7 )}{2 ( - 2 )}

8^{2} - 4 (- 2) (- 7) = 22

x_{1, 2} = \frac{- 8 \pm 2 2}{2 ( - 2 )}

解を分離する

x_{1} = \frac{- 8 + 2 2}{2 ( - 2 )}, x_{2} = \frac{- 8 - 2 2}{2 ( - 2 )}

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

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

二次equationの解:

x = \frac{4 - 2}{2}, x = \frac{4 + 2}{2}

グラフ

人気の例

9 a^{2} - 6 a + 1 = 0

5x^2+20x=18x+720+2x

5 x^{2} + 20 x = 18 x + 720 + 2 x

solvefor x,y=x^2-1

so l v e f or x, y = x^{2} - 1

solvefor x,y=x^2-2

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

x (x + 7) = 690