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受欢迎的代数 >

-x^2-4x-1=0

解答

- x^{2} - 4 x - 1 = 0

解答

x = - 2 - 3, x = - 2 + 3

+1

十进制

x = - 3.73205 \dots, x = - 0.26794 \dots

求解步骤

- x^{2} - 4 x - 1 = 0

使用求根公式求解

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

(- 4)^{2} - 4 (- 1) (- 1) = 23

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

将解分隔开

x_{1} = \frac{- ( - 4 ) + 2 3}{2 ( - 1 )}, x_{2} = \frac{- ( - 4 ) - 2 3}{2 ( - 1 )}

x = \frac{- ( - 4 ) + 2 3}{2 ( - 1 )} : - 2 - 3

x = \frac{- ( - 4 ) - 2 3}{2 ( - 1 )} : - 2 + 3

二次方程组的解是:

x = - 2 - 3, x = - 2 + 3

作图

流行的例子

s im pl i f y 1 0^{4}

化简 (1/(sqrt(2)))^4

s im pl i f y (\frac{1}{2})^{4}

5 - 2 x \geq - \frac{1}{4}

因式分解 5n^2-15

f a c t or 5 n^{2} - 15

28 + 19 u = - 8 + 15 u