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受欢迎的代数 >

20=-5x^2-52x

解答

20 = - 5 x^{2} - 52 x

解答

x = - 10, x = - \frac{2}{5}

+1

十进制

x = - 10, x = - 0.4

求解步骤

20 = - 5 x^{2} - 52 x

交换两边

- 5 x^{2} - 52 x = 20

将

20

para o lado esquerdo

- 5 x^{2} - 52 x - 20 = 0

使用求根公式求解

x_{1, 2} = \frac{- ( - 52 ) \pm ( - 52 ) ^{2} - 4 ( - 5 ) ( - 20 )}{2 ( - 5 )}

(- 52)^{2} - 4 (- 5) (- 20) = 48

x_{1, 2} = \frac{- ( - 52 ) \pm 48}{2 ( - 5 )}

将解分隔开

x_{1} = \frac{- ( - 52 ) + 48}{2 ( - 5 )}, x_{2} = \frac{- ( - 52 ) - 48}{2 ( - 5 )}

x = \frac{- ( - 52 ) + 48}{2 ( - 5 )} : - 10

x = \frac{- ( - 52 ) - 48}{2 ( - 5 )} : - \frac{2}{5}

二次方程组的解是:

x = - 10, x = - \frac{2}{5}

作图

流行的例子

4 y^{2} + 9 = 0

v^{2} = - 28

- 2 x^{2} + 5 x + 2 = 0

11 x + 18 = x^{2}

(2x-13/4)^2= 121/16

(2 x - \frac{13}{4})^{2} = \frac{121}{16}