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人気のある代数 >

-2x^2+5x+4=0

解

- 2 x^{2} + 5 x + 4 = 0

解

x = - \frac{- 5 + 57}{4}, x = \frac{5 + 57}{4}

+1

十進法表記

x = - 0.63745 \dots, x = 3.13745 \dots

解答ステップ

- 2 x^{2} + 5 x + 4 = 0

解くとthe二次式

x_{1, 2} = \frac{- 5 \pm 5 ^{2} - 4 ( - 2 ) \cdot 4}{2 ( - 2 )}

5^{2} - 4 (- 2) \cdot 4 = 57

x_{1, 2} = \frac{- 5 \pm 57}{2 ( - 2 )}

解を分離する

x_{1} = \frac{- 5 + 57}{2 ( - 2 )}, x_{2} = \frac{- 5 - 57}{2 ( - 2 )}

x = \frac{- 5 + 57}{2 ( - 2 )} : - \frac{- 5 + 57}{4}

x = \frac{- 5 - 57}{2 ( - 2 )} : \frac{5 + 57}{4}

二次equationの解:

x = - \frac{- 5 + 57}{4}, x = \frac{5 + 57}{4}

グラフ

人気の例

16 p^{2} - 24 p + 5 = 0

solvefor x,16x^2-m^2=0

so l v e f or x, 16 x^{2} - m^{2} = 0

x^2+6x-78=3(x-8)

x^{2} + 6 x - 78 = 3 (x - 8)

solvefor w,-32aw-15a^2=-7w^2

so l v e f or w, - 32 a w - 15 a^{2} = - 7 w^{2}

solvefor x,x^2+kx-2k^2=0

so l v e f or x, x^{2} + k x - 2 k^{2} = 0