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受欢迎的代数 >

-2x^2-3x+12=0

解答

- 2 x^{2} - 3 x + 12 = 0

解答

x = - \frac{3 + 105}{4}, x = \frac{105 - 3}{4}

+1

十进制

x = - 3.31173 \dots, x = 1.81173 \dots

求解步骤

- 2 x^{2} - 3 x + 12 = 0

使用求根公式求解

x_{1, 2} = \frac{- ( - 3 ) \pm ( - 3 ) ^{2} - 4 ( - 2 ) \cdot 12}{2 ( - 2 )}

(- 3)^{2} - 4 (- 2) \cdot 12 = 105

x_{1, 2} = \frac{- ( - 3 ) \pm 105}{2 ( - 2 )}

将解分隔开

x_{1} = \frac{- ( - 3 ) + 105}{2 ( - 2 )}, x_{2} = \frac{- ( - 3 ) - 105}{2 ( - 2 )}

x = \frac{- ( - 3 ) + 105}{2 ( - 2 )} : - \frac{3 + 105}{4}

x = \frac{- ( - 3 ) - 105}{2 ( - 2 )} : \frac{105 - 3}{4}

二次方程组的解是:

x = - \frac{3 + 105}{4}, x = \frac{105 - 3}{4}

作图

流行的例子

(x - 4)^{2} = - 4

3x^2-4x<2x^2+21

3 x^{2} - 4 x < 2 x^{2} + 21

(240-80x)/3*0.22=(80x)/3*0.21

\frac{240 - 80 x}{3} \cdot 0.22 = \frac{80 x}{3} \cdot 0.21

16 x^{2} = 56 x - 51

因式分解 6x(x-4)^4+12x^2(x-4)^3

f a c t or 6 x (x - 4)^{4} + 12 x^{2} (x - 4)^{3}