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受欢迎的代数 >

s^2+10s+8=0

解答

s^{2} + 10 s + 8 = 0

解答

s = - 5 + 17, s = - 5 - 17

+1

十进制

s = - 0.87689 \dots, s = - 9.12310 \dots

求解步骤

s^{2} + 10 s + 8 = 0

使用求根公式求解

s_{1, 2} = \frac{- 10 \pm 1 0 ^{2} - 4 \cdot 1 \cdot 8}{2 \cdot 1}

1 0^{2} - 4 \cdot 1 \cdot 8 = 217

s_{1, 2} = \frac{- 10 \pm 2 17}{2 \cdot 1}

将解分隔开

s_{1} = \frac{- 10 + 2 17}{2 \cdot 1}, s_{2} = \frac{- 10 - 2 17}{2 \cdot 1}

s = \frac{- 10 + 2 17}{2 \cdot 1} : - 5 + 17

s = \frac{- 10 - 2 17}{2 \cdot 1} : - 5 - 17

二次方程组的解是:

s = - 5 + 17, s = - 5 - 17

作图

流行的例子

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