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受欢迎的代数 >

y^2-14y+4=0

解答

y^{2} - 14 y + 4 = 0

解答

y = 7 + 35, y = 7 - 35

+1

十进制

y = 13.70820 \dots, y = 0.29179 \dots

求解步骤

y^{2} - 14 y + 4 = 0

使用求根公式求解

y_{1, 2} = \frac{- ( - 14 ) \pm ( - 14 ) ^{2} - 4 \cdot 1 \cdot 4}{2 \cdot 1}

(- 14)^{2} - 4 \cdot 1 \cdot 4 = 65

y_{1, 2} = \frac{- ( - 14 ) \pm 6 5}{2 \cdot 1}

将解分隔开

y_{1} = \frac{- ( - 14 ) + 6 5}{2 \cdot 1}, y_{2} = \frac{- ( - 14 ) - 6 5}{2 \cdot 1}

y = \frac{- ( - 14 ) + 6 5}{2 \cdot 1} : 7 + 35

y = \frac{- ( - 14 ) - 6 5}{2 \cdot 1} : 7 - 35

二次方程组的解是:

y = 7 + 35, y = 7 - 35

作图

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