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受欢迎的代数 >

5x^2+8x-8=0

解答

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

解答

x = \frac{2 ( 14 - 2 )}{5}, x = - \frac{2 ( 2 + 14 )}{5}

+1

十进制

x = 0.69666 \dots, x = - 2.29666 \dots

求解步骤

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

使用求根公式求解

x_{1, 2} = \frac{- 8 \pm 8 ^{2} - 4 \cdot 5 ( - 8 )}{2 \cdot 5}

8^{2} - 4 \cdot 5 (- 8) = 414

x_{1, 2} = \frac{- 8 \pm 4 14}{2 \cdot 5}

将解分隔开

x_{1} = \frac{- 8 + 4 14}{2 \cdot 5}, x_{2} = \frac{- 8 - 4 14}{2 \cdot 5}

x = \frac{- 8 + 4 14}{2 \cdot 5} : \frac{2 ( 14 - 2 )}{5}

x = \frac{- 8 - 4 14}{2 \cdot 5} : - \frac{2 ( 2 + 14 )}{5}

二次方程组的解是:

x = \frac{2 ( 14 - 2 )}{5}, x = - \frac{2 ( 2 + 14 )}{5}

作图

流行的例子

(3-h)^2+(5-k)^2=r^2

(3 - h)^{2} + (5 - k)^{2} = r^{2}

5 a^{2} + 21 = 49

x - 1 = x^{2} - 4 x + 3

0 = - x^{2} + 10 x - 8

55 - 24 b + 2 b^{2} = 1