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受欢迎的代数 >

s^2+6s+8.5=0

解答

s^{2} + 6 s + 8.5 = 0

解答

s = \frac{- 6 + 2}{2}, s = - \frac{6 + 2}{2}

+1

十进制

s = - 2.29289 \dots, s = - 3.70710 \dots

求解步骤

s^{2} + 6 s + 8.5 = 0

在两边乘以

10

10 s^{2} + 60 s + 85 = 0

使用求根公式求解

s_{1, 2} = \frac{- 60 \pm 6 0 ^{2} - 4 \cdot 10 \cdot 85}{2 \cdot 10}

6 0^{2} - 4 \cdot 10 \cdot 85 = 102

s_{1, 2} = \frac{- 60 \pm 10 2}{2 \cdot 10}

将解分隔开

s_{1} = \frac{- 60 + 10 2}{2 \cdot 10}, s_{2} = \frac{- 60 - 10 2}{2 \cdot 10}

s = \frac{- 60 + 10 2}{2 \cdot 10} : \frac{- 6 + 2}{2}

s = \frac{- 60 - 10 2}{2 \cdot 10} : - \frac{6 + 2}{2}

二次方程组的解是:

s = \frac{- 6 + 2}{2}, s = - \frac{6 + 2}{2}

作图

流行的例子

\frac{p - 9}{3} = 2

因式分解 2b^2-5b-3

f a c t or 2 b^{2} - 5 b - 3

8 x^{2} + 5 x = - 4

2x+5+2x+3x=9x+7

2 x + 5 + 2 x + 3 x = 9 x + 7

\frac{- 3 ( x + 3 )}{2} < 6