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受欢迎的代数 >

y^2+8.19y-15=0

解答

y^{2} + 8.19 y - 15 = 0

解答

y = \frac{- 819 + 1270761}{200}, y = \frac{- 819 - 1270761}{200}

+1

十进制

y = 1.54140 \dots, y = - 9.73140 \dots

求解步骤

y^{2} + 8.19 y - 15 = 0

在两边乘以

100

100 y^{2} + 819 y - 1500 = 0

使用求根公式求解

y_{1, 2} = \frac{- 819 \pm 81 9 ^{2} - 4 \cdot 100 ( - 1500 )}{2 \cdot 100}

81 9^{2} - 4 \cdot 100 (- 1500) = 1270761

y_{1, 2} = \frac{- 819 \pm 1270761}{2 \cdot 100}

将解分隔开

y_{1} = \frac{- 819 + 1270761}{2 \cdot 100}, y_{2} = \frac{- 819 - 1270761}{2 \cdot 100}

y = \frac{- 819 + 1270761}{2 \cdot 100} : \frac{- 819 + 1270761}{200}

y = \frac{- 819 - 1270761}{2 \cdot 100} : \frac{- 819 - 1270761}{200}

二次方程组的解是:

y = \frac{- 819 + 1270761}{200}, y = \frac{- 819 - 1270761}{200}

作图

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