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受欢迎的代数 >

4u^2-19u-5=0

解答

4 u^{2} - 19 u - 5 = 0

解答

u = 5, u = - \frac{1}{4}

+1

十进制

u = 5, u = - 0.25

求解步骤

4 u^{2} - 19 u - 5 = 0

使用求根公式求解

u_{1, 2} = \frac{- ( - 19 ) \pm ( - 19 ) ^{2} - 4 \cdot 4 ( - 5 )}{2 \cdot 4}

(- 19)^{2} - 4 \cdot 4 (- 5) = 21

u_{1, 2} = \frac{- ( - 19 ) \pm 21}{2 \cdot 4}

将解分隔开

u_{1} = \frac{- ( - 19 ) + 21}{2 \cdot 4}, u_{2} = \frac{- ( - 19 ) - 21}{2 \cdot 4}

u = \frac{- ( - 19 ) + 21}{2 \cdot 4} : 5

u = \frac{- ( - 19 ) - 21}{2 \cdot 4} : - \frac{1}{4}

二次方程组的解是:

u = 5, u = - \frac{1}{4}

作图

流行的例子

solvefor x,2x^2+4x+2=0

so l v e f or x, 2 x^{2} + 4 x + 2 = 0

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