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受欢迎的代数 >

-2x^2+6x+3=0

解答

- 2 x^{2} + 6 x + 3 = 0

解答

x = - \frac{- 3 + 15}{2}, x = \frac{3 + 15}{2}

+1

十进制

x = - 0.43649 \dots, x = 3.43649 \dots

求解步骤

- 2 x^{2} + 6 x + 3 = 0

使用求根公式求解

x_{1, 2} = \frac{- 6 \pm 6 ^{2} - 4 ( - 2 ) \cdot 3}{2 ( - 2 )}

6^{2} - 4 (- 2) \cdot 3 = 215

x_{1, 2} = \frac{- 6 \pm 2 15}{2 ( - 2 )}

将解分隔开

x_{1} = \frac{- 6 + 2 15}{2 ( - 2 )}, x_{2} = \frac{- 6 - 2 15}{2 ( - 2 )}

x = \frac{- 6 + 2 15}{2 ( - 2 )} : - \frac{- 3 + 15}{2}

x = \frac{- 6 - 2 15}{2 ( - 2 )} : \frac{3 + 15}{2}

二次方程组的解是:

x = - \frac{- 3 + 15}{2}, x = \frac{3 + 15}{2}

作图

流行的例子

w^{2} + 11 w + 30 = 0

s im pl i f y \frac{5}{2} - 4

s im pl i f y (\frac{5}{8})^{1}

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

28-7x<=-4(-7x-7)

28 - 7 x \leq - 4 (- 7 x - 7)