solvefor x,4x^2-8kx=0

解答

x, 4 x^{2} - 8 k x = 0

x = 2 k, x = 0

求解步骤

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

使用求根公式求解

x_{1, 2} = \frac{- ( - 8 k ) \pm ( - 8 k ) ^{2} - 4 \cdot 4 \cdot 0}{2 \cdot 4}

化简

(- 8 k)^{2} - 4 \cdot 4 \cdot 0 : 8 k

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

将解分隔开

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

x = \frac{- ( - 8 k ) + 8 k}{2 \cdot 4} : 2 k

x = \frac{- ( - 8 k ) - 8 k}{2 \cdot 4} : 0

二次方程组的解是:

x = 2 k, x = 0

- 0.000003 x^{2} - 0.02 x + 100 = 0

6 q^{2} + 7 q - 20 = 0

0 = 210 - 205.06 x + 4.9 x^{2}

r^{2} - 10 r + 21 = 0

x (x + 6) = 16 (x + x + 6) - 9