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人気のある代数 >

2x^2-8x-15=0

解

2 x^{2} - 8 x - 15 = 0

解

x = \frac{4 + 46}{2}, x = \frac{4 - 46}{2}

+1

十進法表記

x = 5.39116 \dots, x = - 1.39116 \dots

解答ステップ

2 x^{2} - 8 x - 15 = 0

解くとthe二次式

x_{1, 2} = \frac{- ( - 8 ) \pm ( - 8 ) ^{2} - 4 \cdot 2 ( - 15 )}{2 \cdot 2}

(- 8)^{2} - 4 \cdot 2 (- 15) = 246

x_{1, 2} = \frac{- ( - 8 ) \pm 2 46}{2 \cdot 2}

解を分離する

x_{1} = \frac{- ( - 8 ) + 2 46}{2 \cdot 2}, x_{2} = \frac{- ( - 8 ) - 2 46}{2 \cdot 2}

x = \frac{- ( - 8 ) + 2 46}{2 \cdot 2} : \frac{4 + 46}{2}

x = \frac{- ( - 8 ) - 2 46}{2 \cdot 2} : \frac{4 - 46}{2}

二次equationの解:

x = \frac{4 + 46}{2}, x = \frac{4 - 46}{2}

グラフ

人気の例

4x+6x(x-5)+12=x^2+7

4 x + 6 x (x - 5) + 12 = x^{2} + 7

根 x^2+6x+58=0

roo t s x^{2} + 6 x + 58 = 0

solvefor t,d=vt+(at^2)/2

so l v e f or t, d = v t + \frac{a t ^{2}}{2}

36 = 12 x - x^{2}

2 x^{2} + 3 x - 54 = 0