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受欢迎的代数 >

-2x^2+10x+23=0

解答

- 2 x^{2} + 10 x + 23 = 0

解答

x = - \frac{- 5 + 71}{2}, x = \frac{5 + 71}{2}

+1

十进制

x = - 1.71307 \dots, x = 6.71307 \dots

求解步骤

- 2 x^{2} + 10 x + 23 = 0

使用求根公式求解

x_{1, 2} = \frac{- 10 \pm 1 0 ^{2} - 4 ( - 2 ) \cdot 23}{2 ( - 2 )}

1 0^{2} - 4 (- 2) \cdot 23 = 271

x_{1, 2} = \frac{- 10 \pm 2 71}{2 ( - 2 )}

将解分隔开

x_{1} = \frac{- 10 + 2 71}{2 ( - 2 )}, x_{2} = \frac{- 10 - 2 71}{2 ( - 2 )}

x = \frac{- 10 + 2 71}{2 ( - 2 )} : - \frac{- 5 + 71}{2}

x = \frac{- 10 - 2 71}{2 ( - 2 )} : \frac{5 + 71}{2}

二次方程组的解是:

x = - \frac{- 5 + 71}{2}, x = \frac{5 + 71}{2}

作图

流行的例子

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