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受欢迎的代数 >

-24=-5b-b^2

解答

- 24 = - 5 b - b^{2}

解答

b = - 8, b = 3

求解步骤

- 24 = - 5 b - b^{2}

交换两边

- 5 b - b^{2} = - 24

将

24

para o lado esquerdo

- 5 b - b^{2} + 24 = 0

改写成标准形式

a x^{2} + b x + c = 0

- b^{2} - 5 b + 24 = 0

使用求根公式求解

b_{1, 2} = \frac{- ( - 5 ) \pm ( - 5 ) ^{2} - 4 ( - 1 ) \cdot 24}{2 ( - 1 )}

(- 5)^{2} - 4 (- 1) \cdot 24 = 11

b_{1, 2} = \frac{- ( - 5 ) \pm 11}{2 ( - 1 )}

将解分隔开

b_{1} = \frac{- ( - 5 ) + 11}{2 ( - 1 )}, b_{2} = \frac{- ( - 5 ) - 11}{2 ( - 1 )}

b = \frac{- ( - 5 ) + 11}{2 ( - 1 )} : - 8

b = \frac{- ( - 5 ) - 11}{2 ( - 1 )} : 3

二次方程组的解是:

b = - 8, b = 3

作图

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