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受欢迎的代数 >

7.9461x^2+7.2x-7.9461=0

解答

7.9461 x^{2} + 7.2 x - 7.9461 = 0

解答

x = \frac{- 7.2 + 304.40202 \dots}{15.8922}, x = \frac{- 7.2 - 304.40202 \dots}{15.8922}

+1

十进制

x = 0.64478 \dots, x = - 1.55089 \dots

求解步骤

7.9461 x^{2} + 7.2 x - 7.9461 = 0

使用求根公式求解

x_{1, 2} = \frac{- 7.2 \pm 7. 2 ^{2} - 4 \cdot 7.9461 ( - 7.9461 )}{2 \cdot 7.9461}

7. 2^{2} - 4 \cdot 7.9461 (- 7.9461) = 304.40202 \dots

x_{1, 2} = \frac{- 7.2 \pm 304.40202 \dots}{2 \cdot 7.9461}

将解分隔开

x_{1} = \frac{- 7.2 + 304.40202 \dots}{2 \cdot 7.9461}, x_{2} = \frac{- 7.2 - 304.40202 \dots}{2 \cdot 7.9461}

x = \frac{- 7.2 + 304.40202 \dots}{2 \cdot 7.9461} : \frac{- 7.2 + 304.40202 \dots}{15.8922}

x = \frac{- 7.2 - 304.40202 \dots}{2 \cdot 7.9461} : \frac{- 7.2 - 304.40202 \dots}{15.8922}

二次方程组的解是:

x = \frac{- 7.2 + 304.40202 \dots}{15.8922}, x = \frac{- 7.2 - 304.40202 \dots}{15.8922}

作图

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