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人気のある代数 >

4.9x^2+16.8x+7.6=0

解

4.9 x^{2} + 16.8 x + 7.6 = 0

解

x = \frac{2 ( 17 - 6 )}{7}, x = - \frac{2 ( 6 + 17 )}{7}

+1

十進法表記

x = - 0.53625 \dots, x = - 2.89231 \dots

解答ステップ

4.9 x^{2} + 16.8 x + 7.6 = 0

以下で両辺を乗じる:

10

49 x^{2} + 168 x + 76 = 0

解くとthe二次式

x_{1, 2} = \frac{- 168 \pm 16 8 ^{2} - 4 \cdot 49 \cdot 76}{2 \cdot 49}

16 8^{2} - 4 \cdot 49 \cdot 76 = 2817

x_{1, 2} = \frac{- 168 \pm 28 17}{2 \cdot 49}

解を分離する

x_{1} = \frac{- 168 + 28 17}{2 \cdot 49}, x_{2} = \frac{- 168 - 28 17}{2 \cdot 49}

x = \frac{- 168 + 28 17}{2 \cdot 49} : \frac{2 ( 17 - 6 )}{7}

x = \frac{- 168 - 28 17}{2 \cdot 49} : - \frac{2 ( 6 + 17 )}{7}

二次equationの解:

x = \frac{2 ( 17 - 6 )}{7}, x = - \frac{2 ( 6 + 17 )}{7}

グラフ

人気の例

- 4 = x^{2} + 5 x

completesquare x^2+10x=-9

co m pl e t es q u a re x^{2} + 10 x = - 9

4 k^{2} - 2 = - 15

22-22x=(5x+3)(x-1)

22 - 22 x = (5 x + 3) (x - 1)

-4n^2=6n+16-5n^2

- 4 n^{2} = 6 n + 16 - 5 n^{2}