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受欢迎的代数 >

7x^2+9x-148=0

解答

7 x^{2} + 9 x - 148 = 0

解答

x = 4, x = - \frac{37}{7}

+1

十进制

x = 4, x = - 5.28571 \dots

求解步骤

7 x^{2} + 9 x - 148 = 0

使用求根公式求解

x_{1, 2} = \frac{- 9 \pm 9 ^{2} - 4 \cdot 7 ( - 148 )}{2 \cdot 7}

9^{2} - 4 \cdot 7 (- 148) = 65

x_{1, 2} = \frac{- 9 \pm 65}{2 \cdot 7}

将解分隔开

x_{1} = \frac{- 9 + 65}{2 \cdot 7}, x_{2} = \frac{- 9 - 65}{2 \cdot 7}

x = \frac{- 9 + 65}{2 \cdot 7} : 4

x = \frac{- 9 - 65}{2 \cdot 7} : - \frac{37}{7}

二次方程组的解是:

x = 4, x = - \frac{37}{7}

作图

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