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受欢迎的代数 >

m^2-7m-60=0

解答

m^{2} - 7 m - 60 = 0

解答

m = 12, m = - 5

求解步骤

m^{2} - 7 m - 60 = 0

使用求根公式求解

m_{1, 2} = \frac{- ( - 7 ) \pm ( - 7 ) ^{2} - 4 \cdot 1 \cdot ( - 60 )}{2 \cdot 1}

(- 7)^{2} - 4 \cdot 1 \cdot (- 60) = 17

m_{1, 2} = \frac{- ( - 7 ) \pm 17}{2 \cdot 1}

将解分隔开

m_{1} = \frac{- ( - 7 ) + 17}{2 \cdot 1}, m_{2} = \frac{- ( - 7 ) - 17}{2 \cdot 1}

m = \frac{- ( - 7 ) + 17}{2 \cdot 1} : 12

m = \frac{- ( - 7 ) - 17}{2 \cdot 1} : - 5

二次方程组的解是:

m = 12, m = - 5

作图

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