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受欢迎的代数 >

solvefor x,8x^2-kx+2=0

解答

x, 8 x^{2} - k x + 2 = 0

解答

x = \frac{k + k ^{2} - 64}{16}, x = \frac{k - k ^{2} - 64}{16}

求解步骤

8 x^{2} - k x + 2 = 0

使用求根公式求解

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

化简

(- k)^{2} - 4 \cdot 8 \cdot 2 : k^{2} - 64

x_{1, 2} = \frac{- ( - k ) \pm k ^{2} - 64}{2 \cdot 8}

将解分隔开

x_{1} = \frac{- ( - k ) + k ^{2} - 64}{2 \cdot 8}, x_{2} = \frac{- ( - k ) - k ^{2} - 64}{2 \cdot 8}

x = \frac{- ( - k ) + k ^{2} - 64}{2 \cdot 8} : \frac{k + k ^{2} - 64}{16}

x = \frac{- ( - k ) - k ^{2} - 64}{2 \cdot 8} : \frac{k - k ^{2} - 64}{16}

二次方程组的解是:

x = \frac{k + k ^{2} - 64}{16}, x = \frac{k - k ^{2} - 64}{16}

作图

流行的例子

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2 x^{2} + 2 x = 0

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so l v e f or x, x^{2} + y^{2} = - 3

3x(x-5)-(8+2x)=4(x-7)+2x

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