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受欢迎的代数 >

2x^2-15x=8

解答

2 x^{2} - 15 x = 8

解答

x = 8, x = - \frac{1}{2}

+1

十进制

x = 8, x = - 0.5

求解步骤

2 x^{2} - 15 x = 8

将

8

para o lado esquerdo

2 x^{2} - 15 x - 8 = 0

使用求根公式求解

x_{1, 2} = \frac{- ( - 15 ) \pm ( - 15 ) ^{2} - 4 \cdot 2 ( - 8 )}{2 \cdot 2}

(- 15)^{2} - 4 \cdot 2 (- 8) = 17

x_{1, 2} = \frac{- ( - 15 ) \pm 17}{2 \cdot 2}

将解分隔开

x_{1} = \frac{- ( - 15 ) + 17}{2 \cdot 2}, x_{2} = \frac{- ( - 15 ) - 17}{2 \cdot 2}

x = \frac{- ( - 15 ) + 17}{2 \cdot 2} : 8

x = \frac{- ( - 15 ) - 17}{2 \cdot 2} : - \frac{1}{2}

二次方程组的解是:

x = 8, x = - \frac{1}{2}

作图

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