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人気のある代数 >

1.3x^2-4x=3.5

解

1.3 x^{2} - 4 x = 3.5

解

x = \frac{20 + 3 95}{13}, x = \frac{20 - 3 95}{13}

+1

十進法表記

x = 3.78772 \dots, x = - 0.71079 \dots

解答ステップ

1.3 x^{2} - 4 x = 3.5

以下で両辺を乗じる:

10

13 x^{2} - 40 x = 35

35

を左側に移動します

13 x^{2} - 40 x - 35 = 0

解くとthe二次式

x_{1, 2} = \frac{- ( - 40 ) \pm ( - 40 ) ^{2} - 4 \cdot 13 ( - 35 )}{2 \cdot 13}

(- 40)^{2} - 4 \cdot 13 (- 35) = 695

x_{1, 2} = \frac{- ( - 40 ) \pm 6 95}{2 \cdot 13}

解を分離する

x_{1} = \frac{- ( - 40 ) + 6 95}{2 \cdot 13}, x_{2} = \frac{- ( - 40 ) - 6 95}{2 \cdot 13}

x = \frac{- ( - 40 ) + 6 95}{2 \cdot 13} : \frac{20 + 3 95}{13}

x = \frac{- ( - 40 ) - 6 95}{2 \cdot 13} : \frac{20 - 3 95}{13}

二次equationの解:

x = \frac{20 + 3 95}{13}, x = \frac{20 - 3 95}{13}

グラフ

人気の例

solvefor x,Cx^2+x+y^2=0

so l v e f or x, C x^{2} + x + y^{2} = 0

x^{2} - 8 x + 16 = - 12

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

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

(k+1)x^2-(k-1)x-(k+2)=0

(k + 1) x^{2} - (k - 1) x - (k + 2) = 0

0 = x^{2} - 36