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受欢迎的代数 >

v^2+18v+81=50

解答

v^{2} + 18 v + 81 = 50

解答

v = - 9 + 52, v = - 9 - 52

+1

十进制

v = - 1.92893 \dots, v = - 16.07106 \dots

求解步骤

v^{2} + 18 v + 81 = 50

将

50

para o lado esquerdo

v^{2} + 18 v + 31 = 0

使用求根公式求解

v_{1, 2} = \frac{- 18 \pm 1 8 ^{2} - 4 \cdot 1 \cdot 31}{2 \cdot 1}

1 8^{2} - 4 \cdot 1 \cdot 31 = 102

v_{1, 2} = \frac{- 18 \pm 10 2}{2 \cdot 1}

将解分隔开

v_{1} = \frac{- 18 + 10 2}{2 \cdot 1}, v_{2} = \frac{- 18 - 10 2}{2 \cdot 1}

v = \frac{- 18 + 10 2}{2 \cdot 1} : - 9 + 52

v = \frac{- 18 - 10 2}{2 \cdot 1} : - 9 - 52

二次方程组的解是:

v = - 9 + 52, v = - 9 - 52

作图

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