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人気のある代数 >

2x^2-20x=-49

解

2 x^{2} - 20 x = - 49

解

x = \frac{10 + 2}{2}, x = \frac{10 - 2}{2}

+1

十進法表記

x = 5.70710 \dots, x = 4.29289 \dots

解答ステップ

2 x^{2} - 20 x = - 49

49

を左側に移動します

2 x^{2} - 20 x + 49 = 0

解くとthe二次式

x_{1, 2} = \frac{- ( - 20 ) \pm ( - 20 ) ^{2} - 4 \cdot 2 \cdot 49}{2 \cdot 2}

(- 20)^{2} - 4 \cdot 2 \cdot 49 = 22

x_{1, 2} = \frac{- ( - 20 ) \pm 2 2}{2 \cdot 2}

解を分離する

x_{1} = \frac{- ( - 20 ) + 2 2}{2 \cdot 2}, x_{2} = \frac{- ( - 20 ) - 2 2}{2 \cdot 2}

x = \frac{- ( - 20 ) + 2 2}{2 \cdot 2} : \frac{10 + 2}{2}

x = \frac{- ( - 20 ) - 2 2}{2 \cdot 2} : \frac{10 - 2}{2}

二次equationの解:

x = \frac{10 + 2}{2}, x = \frac{10 - 2}{2}

グラフ

人気の例

y^{2} + 75 = - 28 y

solvefor x,f(x+h)=3-5x-2x^2

so l v e f or x, f (x + h) = 3 - 5 x - 2 x^{2}

solvefor x,f(x+2)=3x^2+4x-2

so l v e f or x, f (x + 2) = 3 x^{2} + 4 x - 2

x^{2} - 6 x - 39 = 0

199=0.1w^2+2.155w+19.985

199 = 0.1 w^{2} + 2.155 w + 19.985