-10x^2+130x-360=0

解答

- 10 x^{2} + 130 x - 360 = 0

x = 4, x = 9

求解步骤

- 10 x^{2} + 130 x - 360 = 0

使用求根公式求解

x_{1, 2} = \frac{- 130 \pm 13 0 ^{2} - 4 ( - 10 ) ( - 360 )}{2 ( - 10 )}

13 0^{2} - 4 (- 10) (- 360) = 50

x_{1, 2} = \frac{- 130 \pm 50}{2 ( - 10 )}

将解分隔开

x_{1} = \frac{- 130 + 50}{2 ( - 10 )}, x_{2} = \frac{- 130 - 50}{2 ( - 10 )}

x = \frac{- 130 + 50}{2 ( - 10 )} : 4

x = \frac{- 130 - 50}{2 ( - 10 )} : 9

二次方程组的解是:

x = 4, x = 9

4 x (5 x + 1) = x + (2 x - 3)

so l v e f or x, 2 y^{3} - 7 x^{2} = 5

2 x^{2} - 32 x = - 120

x^{2} = 2 0^{2} + 1 5^{2}

x^{2} + 2 (3) x - 3 = (3) x^{2} + 1