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受欢迎的代数 >

u^2-40u+400=16

解答

u^{2} - 40 u + 400 = 16

解答

u = 24, u = 16

求解步骤

u^{2} - 40 u + 400 = 16

将

16

para o lado esquerdo

u^{2} - 40 u + 384 = 0

使用求根公式求解

u_{1, 2} = \frac{- ( - 40 ) \pm ( - 40 ) ^{2} - 4 \cdot 1 \cdot 384}{2 \cdot 1}

(- 40)^{2} - 4 \cdot 1 \cdot 384 = 8

u_{1, 2} = \frac{- ( - 40 ) \pm 8}{2 \cdot 1}

将解分隔开

u_{1} = \frac{- ( - 40 ) + 8}{2 \cdot 1}, u_{2} = \frac{- ( - 40 ) - 8}{2 \cdot 1}

u = \frac{- ( - 40 ) + 8}{2 \cdot 1} : 24

u = \frac{- ( - 40 ) - 8}{2 \cdot 1} : 16

二次方程组的解是:

u = 24, u = 16

作图

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