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受欢迎的代数 >

-x^2-4x-4=-2

解答

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

解答

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

+1

十进制

x = - 3.41421 \dots, x = - 0.58578 \dots

求解步骤

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

将

2

para o lado esquerdo

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

使用求根公式求解

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

(- 4)^{2} - 4 (- 1) (- 2) = 22

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

将解分隔开

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

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

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

二次方程组的解是:

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

作图

流行的例子

completesquare 3x^2+24x+50

co m pl e t es q u a re 3 x^{2} + 24 x + 50

solvefor x,f=x^2-4y

so l v e f or x, f = x^{2} - 4 y

3 x^{2} + 15 x + 12 = 0

4 x^{2} - 24 x + 39 = 0

solvefor x,z=x^2+y^2-10x-2y+36

so l v e f or x, z = x^{2} + y^{2} - 10 x - 2 y + 36