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受欢迎的代数 >

2m^2-7m-4=0

解答

2 m^{2} - 7 m - 4 = 0

解答

m = 4, m = - \frac{1}{2}

+1

十进制

m = 4, m = - 0.5

求解步骤

2 m^{2} - 7 m - 4 = 0

使用求根公式求解

m_{1, 2} = \frac{- ( - 7 ) \pm ( - 7 ) ^{2} - 4 \cdot 2 ( - 4 )}{2 \cdot 2}

(- 7)^{2} - 4 \cdot 2 (- 4) = 9

m_{1, 2} = \frac{- ( - 7 ) \pm 9}{2 \cdot 2}

将解分隔开

m_{1} = \frac{- ( - 7 ) + 9}{2 \cdot 2}, m_{2} = \frac{- ( - 7 ) - 9}{2 \cdot 2}

m = \frac{- ( - 7 ) + 9}{2 \cdot 2} : 4

m = \frac{- ( - 7 ) - 9}{2 \cdot 2} : - \frac{1}{2}

二次方程组的解是:

m = 4, m = - \frac{1}{2}

作图

流行的例子

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co m pl e t es q u a re 2 x^{2} - 4 x + 3 = 0