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受欢迎的代数 >

(x-8)^2-7(x-7)(x+7)-8x=(x+8)^2-x(7x-1)

解答

(x - 8)^{2} - 7 (x - 7) (x + 7) - 8 x = (x + 8)^{2} - x (7 x - 1)

解答

x = \frac{343}{41}

+1

十进制

x = 8.36585 \dots

求解步骤

(x - 8)^{2} - 7 (x - 7) (x + 7) - 8 x = (x + 8)^{2} - x (7 x - 1)

展开

(x - 8)^{2} - 7 (x - 7) (x + 7) - 8 x : - 6 x^{2} - 24 x + 407

展开

(x + 8)^{2} - x (7 x - 1) : - 6 x^{2} + 17 x + 64

- 6 x^{2} - 24 x + 407 = - 6 x^{2} + 17 x + 64

将

407

到右边

- 6 x^{2} - 24 x = - 6 x^{2} + 17 x - 343

两边减去

- 6 x^{2} + 17 x

- 6 x^{2} - 24 x - (- 6 x^{2} + 17 x) = - 6 x^{2} + 17 x - 343 - (- 6 x^{2} + 17 x)

化简

- 41 x = - 343

两边除以

- 41

x = \frac{343}{41}

作图

流行的例子

solvefor x,3x+y+z=2

so l v e f or x, 3 x + y + z = 2

solvefor x,3x-4y=-2

so l v e f or x, 3 x - 4 y = - 2

solvefor y,x=2y+8

so l v e f or y, x = 2 y + 8

x = 17 - 2

3 (k - 5) = - 16