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人気のある代数 >

3x^2+12x-21=0

解

3 x^{2} + 12 x - 21 = 0

解

x = - 2 + 11, x = - 2 - 11

+1

十進法表記

x = 1.31662 \dots, x = - 5.31662 \dots

解答ステップ

3 x^{2} + 12 x - 21 = 0

解くとthe二次式

x_{1, 2} = \frac{- 12 \pm 1 2 ^{2} - 4 \cdot 3 ( - 21 )}{2 \cdot 3}

1 2^{2} - 4 \cdot 3 (- 21) = 611

x_{1, 2} = \frac{- 12 \pm 6 11}{2 \cdot 3}

解を分離する

x_{1} = \frac{- 12 + 6 11}{2 \cdot 3}, x_{2} = \frac{- 12 - 6 11}{2 \cdot 3}

x = \frac{- 12 + 6 11}{2 \cdot 3} : - 2 + 11

x = \frac{- 12 - 6 11}{2 \cdot 3} : - 2 - 11

二次equationの解:

x = - 2 + 11, x = - 2 - 11

グラフ

人気の例

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

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

solvefor y,x^2+(y-\sqrt[3]{x^2})^2=1

so l v e f or y, x^{2} + (y - 3 x^{2})^{2} = 1

completesquare x^2

co m pl e t es q u a re x^{2}

4 x^{2} + 5 = 12 x

2 x^{2} + 6 x - 16 = 0