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受欢迎的代数 >

-2x^2+x+9=0

解答

- 2 x^{2} + x + 9 = 0

解答

x = - \frac{- 1 + 73}{4}, x = \frac{1 + 73}{4}

+1

十进制

x = - 1.88600 \dots, x = 2.38600 \dots

求解步骤

- 2 x^{2} + x + 9 = 0

使用求根公式求解

x_{1, 2} = \frac{- 1 \pm 1 ^{2} - 4 ( - 2 ) \cdot 9}{2 ( - 2 )}

1^{2} - 4 (- 2) \cdot 9 = 73

x_{1, 2} = \frac{- 1 \pm 73}{2 ( - 2 )}

将解分隔开

x_{1} = \frac{- 1 + 73}{2 ( - 2 )}, x_{2} = \frac{- 1 - 73}{2 ( - 2 )}

x = \frac{- 1 + 73}{2 ( - 2 )} : - \frac{- 1 + 73}{4}

x = \frac{- 1 - 73}{2 ( - 2 )} : \frac{1 + 73}{4}

二次方程组的解是:

x = - \frac{- 1 + 73}{4}, x = \frac{1 + 73}{4}

作图

流行的例子

2 x^{2} + 4 x + 11 = 0

roo t s x^{2} - 5 x - 6

x^{2} - 12 x + 36 = 13

x^{2} = \frac{x}{2}

因式分解 x^2+3x-68=3x-4

f a c t or x^{2} + 3 x - 68 = 3 x - 4