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人気のある代数 >

-x^2+4x+8=0

解

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

解

x = - 2 (3 - 1), x = 2 (1 + 3)

+1

十進法表記

x = - 1.46410 \dots, x = 5.46410 \dots

解答ステップ

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

解くとthe二次式

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

4^{2} - 4 (- 1) \cdot 8 = 43

x_{1, 2} = \frac{- 4 \pm 4 3}{2 ( - 1 )}

解を分離する

x_{1} = \frac{- 4 + 4 3}{2 ( - 1 )}, x_{2} = \frac{- 4 - 4 3}{2 ( - 1 )}

x = \frac{- 4 + 4 3}{2 ( - 1 )} : - 2 (3 - 1)

x = \frac{- 4 - 4 3}{2 ( - 1 )} : 2 (1 + 3)

二次equationの解:

x = - 2 (3 - 1), x = 2 (1 + 3)

グラフ

人気の例

solvefor x,x^2+xy=10

so l v e f or x, x^{2} + x y = 10

x^{2} - 18 x = - 106

4 w^{2} + 4 w + 1 = 169

(x^{2} - 2 x + 2) = 0

3 x^{2} - 10 x - 5 = 0