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人気のある代数 >

3x^2+12x+5=0

解

3 x^{2} + 12 x + 5 = 0

解

x = \frac{- 6 + 21}{3}, x = - \frac{6 + 21}{3}

+1

十進法表記

x = - 0.47247 \dots, x = - 3.52752 \dots

解答ステップ

3 x^{2} + 12 x + 5 = 0

解くとthe二次式

x_{1, 2} = \frac{- 12 \pm 1 2 ^{2} - 4 \cdot 3 \cdot 5}{2 \cdot 3}

1 2^{2} - 4 \cdot 3 \cdot 5 = 221

x_{1, 2} = \frac{- 12 \pm 2 21}{2 \cdot 3}

解を分離する

x_{1} = \frac{- 12 + 2 21}{2 \cdot 3}, x_{2} = \frac{- 12 - 2 21}{2 \cdot 3}

x = \frac{- 12 + 2 21}{2 \cdot 3} : \frac{- 6 + 21}{3}

x = \frac{- 12 - 2 21}{2 \cdot 3} : - \frac{6 + 21}{3}

二次equationの解:

x = \frac{- 6 + 21}{3}, x = - \frac{6 + 21}{3}

グラフ

人気の例

solvefor r,r^2=x^2+y^2

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

3 x^{2} + 11 x + 11 = 0

completesquare x^2-6x+4=0

co m pl e t es q u a re x^{2} - 6 x + 4 = 0

2(x+2)^2-(x-1)^2=2x+7

2 (x + 2)^{2} - (x - 1)^{2} = 2 x + 7

x^{2} + 18 x + 326 = 0