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人気のある代数 >

7x^2+8x+2=0

解

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

解

x = \frac{- 4 + 2}{7}, x = - \frac{4 + 2}{7}

+1

十進法表記

x = - 0.36939 \dots, x = - 0.77345 \dots

解答ステップ

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

解くとthe二次式

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

8^{2} - 4 \cdot 7 \cdot 2 = 22

x_{1, 2} = \frac{- 8 \pm 2 2}{2 \cdot 7}

解を分離する

x_{1} = \frac{- 8 + 2 2}{2 \cdot 7}, x_{2} = \frac{- 8 - 2 2}{2 \cdot 7}

x = \frac{- 8 + 2 2}{2 \cdot 7} : \frac{- 4 + 2}{7}

x = \frac{- 8 - 2 2}{2 \cdot 7} : - \frac{4 + 2}{7}

二次equationの解:

x = \frac{- 4 + 2}{7}, x = - \frac{4 + 2}{7}

グラフ

人気の例

3x^2-12=(x-4)^2+8x

3 x^{2} - 12 = (x - 4)^{2} + 8 x

4r(r-3)-3(r-3)=0

4 r (r - 3) - 3 (r - 3) = 0

x^{2} - 18 x - 32 = 0

completesquare k^2+8k+12=0

co m pl e t es q u a re k^{2} + 8 k + 12 = 0

- 6 x + 5 x^{2} = - 8