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受欢迎的代数 >

0=-x^2+6x-8

解答

0 = - x^{2} + 6 x - 8

解答

x = 2, x = 4

求解步骤

0 = - x^{2} + 6 x - 8

交换两边

- x^{2} + 6 x - 8 = 0

使用求根公式求解

x_{1, 2} = \frac{- 6 \pm 6 ^{2} - 4 ( - 1 ) ( - 8 )}{2 ( - 1 )}

6^{2} - 4 (- 1) (- 8) = 2

x_{1, 2} = \frac{- 6 \pm 2}{2 ( - 1 )}

将解分隔开

x_{1} = \frac{- 6 + 2}{2 ( - 1 )}, x_{2} = \frac{- 6 - 2}{2 ( - 1 )}

x = \frac{- 6 + 2}{2 ( - 1 )} : 2

x = \frac{- 6 - 2}{2 ( - 1 )} : 4

二次方程组的解是:

x = 2, x = 4

作图

流行的例子

4 x^{2} - 10 x + 7 = 0

x^{2} = 0.16

x^{2} = 94

solvefor s,t(st^2+2t+s)ds+s^2(1-t^2)dt=0

so l v e f or s, t (s t^{2} + 2 t + s) d s + s^{2} (1 - t^{2}) d t = 0

solvefor x,x^2+y^2+2x+2y+34=0

so l v e f or x, x^{2} + y^{2} + 2 x + 2 y + 34 = 0