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人気のある代数 >

x^2-9.9x-312.5=0

解

x^{2} - 9.9 x - 312.5 = 0

解

x = \frac{99 + 134801}{20}, x = \frac{99 - 134801}{20}

+1

十進法表記

x = 23.30762 \dots, x = - 13.40762 \dots

解答ステップ

x^{2} - 9.9 x - 312.5 = 0

以下で両辺を乗じる:

10

10 x^{2} - 99 x - 3125 = 0

解くとthe二次式

x_{1, 2} = \frac{- ( - 99 ) \pm ( - 99 ) ^{2} - 4 \cdot 10 ( - 3125 )}{2 \cdot 10}

(- 99)^{2} - 4 \cdot 10 (- 3125) = 134801

x_{1, 2} = \frac{- ( - 99 ) \pm 134801}{2 \cdot 10}

解を分離する

x_{1} = \frac{- ( - 99 ) + 134801}{2 \cdot 10}, x_{2} = \frac{- ( - 99 ) - 134801}{2 \cdot 10}

x = \frac{- ( - 99 ) + 134801}{2 \cdot 10} : \frac{99 + 134801}{20}

x = \frac{- ( - 99 ) - 134801}{2 \cdot 10} : \frac{99 - 134801}{20}

二次equationの解:

x = \frac{99 + 134801}{20}, x = \frac{99 - 134801}{20}

グラフ

人気の例

solvefor E,S=(E^2)/Z

so l v e f or E, S = \frac{E ^{2}}{Z}

completesquare 8+4x-x^2

co m pl e t es q u a re 8 + 4 x - x^{2}

(x - 1)^{2} - 80 = 0

(x + a) = (x + a)^{2}

8x^2-2.4x+0.48=0

8 x^{2} - 2.4 x + 0.48 = 0