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受欢迎的代数 >

solvefor x,7x^2+8x-9=10

解答

x, 7 x^{2} + 8 x - 9 = 10

解答

x = \frac{- 4 + 149}{7}, x = - \frac{4 + 149}{7}

+1

十进制

x = 1.17236 \dots, x = - 2.31522 \dots

求解步骤

7 x^{2} + 8 x - 9 = 10

将

10

para o lado esquerdo

7 x^{2} + 8 x - 19 = 0

使用求根公式求解

x_{1, 2} = \frac{- 8 \pm 8 ^{2} - 4 \cdot 7 ( - 19 )}{2 \cdot 7}

8^{2} - 4 \cdot 7 (- 19) = 2149

x_{1, 2} = \frac{- 8 \pm 2 149}{2 \cdot 7}

将解分隔开

x_{1} = \frac{- 8 + 2 149}{2 \cdot 7}, x_{2} = \frac{- 8 - 2 149}{2 \cdot 7}

x = \frac{- 8 + 2 149}{2 \cdot 7} : \frac{- 4 + 149}{7}

x = \frac{- 8 - 2 149}{2 \cdot 7} : - \frac{4 + 149}{7}

二次方程组的解是:

x = \frac{- 4 + 149}{7}, x = - \frac{4 + 149}{7}

作图

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