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受欢迎的代数 >

2x^2+9x=10

解答

2 x^{2} + 9 x = 10

解答

x = \frac{- 9 + 161}{4}, x = \frac{- 9 - 161}{4}

+1

十进制

x = 0.92214 \dots, x = - 5.42214 \dots

求解步骤

2 x^{2} + 9 x = 10

将

10

para o lado esquerdo

2 x^{2} + 9 x - 10 = 0

使用求根公式求解

x_{1, 2} = \frac{- 9 \pm 9 ^{2} - 4 \cdot 2 ( - 10 )}{2 \cdot 2}

9^{2} - 4 \cdot 2 (- 10) = 161

x_{1, 2} = \frac{- 9 \pm 161}{2 \cdot 2}

将解分隔开

x_{1} = \frac{- 9 + 161}{2 \cdot 2}, x_{2} = \frac{- 9 - 161}{2 \cdot 2}

x = \frac{- 9 + 161}{2 \cdot 2} : \frac{- 9 + 161}{4}

x = \frac{- 9 - 161}{2 \cdot 2} : \frac{- 9 - 161}{4}

二次方程组的解是:

x = \frac{- 9 + 161}{4}, x = \frac{- 9 - 161}{4}

作图

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