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受欢迎的代数 >

20x^2-7x=14

解答

20 x^{2} - 7 x = 14

解答

x = \frac{7 + 1169}{40}, x = \frac{7 - 1169}{40}

+1

十进制

x = 1.02976 \dots, x = - 0.67976 \dots

求解步骤

20 x^{2} - 7 x = 14

将

14

para o lado esquerdo

20 x^{2} - 7 x - 14 = 0

使用求根公式求解

x_{1, 2} = \frac{- ( - 7 ) \pm ( - 7 ) ^{2} - 4 \cdot 20 ( - 14 )}{2 \cdot 20}

(- 7)^{2} - 4 \cdot 20 (- 14) = 1169

x_{1, 2} = \frac{- ( - 7 ) \pm 1169}{2 \cdot 20}

将解分隔开

x_{1} = \frac{- ( - 7 ) + 1169}{2 \cdot 20}, x_{2} = \frac{- ( - 7 ) - 1169}{2 \cdot 20}

x = \frac{- ( - 7 ) + 1169}{2 \cdot 20} : \frac{7 + 1169}{40}

x = \frac{- ( - 7 ) - 1169}{2 \cdot 20} : \frac{7 - 1169}{40}

二次方程组的解是:

x = \frac{7 + 1169}{40}, x = \frac{7 - 1169}{40}

作图

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