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受欢迎的代数 >

d^2+8d+12=0

解答

d^{2} + 8 d + 12 = 0

解答

d = - 2, d = - 6

求解步骤

d^{2} + 8 d + 12 = 0

使用求根公式求解

d_{1, 2} = \frac{- 8 \pm 8 ^{2} - 4 \cdot 1 \cdot 12}{2 \cdot 1}

8^{2} - 4 \cdot 1 \cdot 12 = 4

d_{1, 2} = \frac{- 8 \pm 4}{2 \cdot 1}

将解分隔开

d_{1} = \frac{- 8 + 4}{2 \cdot 1}, d_{2} = \frac{- 8 - 4}{2 \cdot 1}

d = \frac{- 8 + 4}{2 \cdot 1} : - 2

d = \frac{- 8 - 4}{2 \cdot 1} : - 6

二次方程组的解是:

d = - 2, d = - 6

作图

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