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受欢迎的代数 >

a^2-9a-36=0

解答

a^{2} - 9 a - 36 = 0

解答

a = 12, a = - 3

求解步骤

a^{2} - 9 a - 36 = 0

使用求根公式求解

a_{1, 2} = \frac{- ( - 9 ) \pm ( - 9 ) ^{2} - 4 \cdot 1 \cdot ( - 36 )}{2 \cdot 1}

(- 9)^{2} - 4 \cdot 1 \cdot (- 36) = 15

a_{1, 2} = \frac{- ( - 9 ) \pm 15}{2 \cdot 1}

将解分隔开

a_{1} = \frac{- ( - 9 ) + 15}{2 \cdot 1}, a_{2} = \frac{- ( - 9 ) - 15}{2 \cdot 1}

a = \frac{- ( - 9 ) + 15}{2 \cdot 1} : 12

a = \frac{- ( - 9 ) - 15}{2 \cdot 1} : - 3

二次方程组的解是:

a = 12, a = - 3

作图

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