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受欢迎的代数 >

x^2+17x-18=-10

解答

x^{2} + 17 x - 18 = - 10

解答

x = \frac{- 17 + 321}{2}, x = \frac{- 17 - 321}{2}

+1

十进制

x = 0.45823 \dots, x = - 17.45823 \dots

求解步骤

x^{2} + 17 x - 18 = - 10

将

10

para o lado esquerdo

x^{2} + 17 x - 8 = 0

使用求根公式求解

x_{1, 2} = \frac{- 17 \pm 1 7 ^{2} - 4 \cdot 1 \cdot ( - 8 )}{2 \cdot 1}

1 7^{2} - 4 \cdot 1 \cdot (- 8) = 321

x_{1, 2} = \frac{- 17 \pm 321}{2 \cdot 1}

将解分隔开

x_{1} = \frac{- 17 + 321}{2 \cdot 1}, x_{2} = \frac{- 17 - 321}{2 \cdot 1}

x = \frac{- 17 + 321}{2 \cdot 1} : \frac{- 17 + 321}{2}

x = \frac{- 17 - 321}{2 \cdot 1} : \frac{- 17 - 321}{2}

二次方程组的解是:

x = \frac{- 17 + 321}{2}, x = \frac{- 17 - 321}{2}

作图

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