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受欢迎的代数 >

(3x+1)^2-2x=9(x+1)*(x-1)1+2(3x+1)

解答

(3 x + 1)^{2} - 2 x = 9 (x + 1) \cdot (x - 1) 1 + 2 (3 x + 1)

解答

x = 4

求解步骤

(3 x + 1)^{2} - 2 x = 9 (x + 1) (x - 1) \cdot 1 + 2 (3 x + 1)

数字相乘:

9 \cdot 1 = 9

(3 x + 1)^{2} - 2 x = 9 (x + 1) (x - 1) + 2 (3 x + 1)

展开

(3 x + 1)^{2} - 2 x : 9 x^{2} + 4 x + 1

展开

9 (x + 1) (x - 1) + 2 (3 x + 1) : 9 x^{2} + 6 x - 7

9 x^{2} + 4 x + 1 = 9 x^{2} + 6 x - 7

将

1

到右边

9 x^{2} + 4 x = 9 x^{2} + 6 x - 8

两边减去

9 x^{2} + 6 x

9 x^{2} + 4 x - (9 x^{2} + 6 x) = 9 x^{2} + 6 x - 8 - (9 x^{2} + 6 x)

化简

- 2 x = - 8

两边除以

- 2

x = 4

作图

流行的例子

solvefor x,f(x-1)=2x+3

so l v e f or x, f (x - 1) = 2 x + 3

solvefor x,9x+6y=-24

so l v e f or x, 9 x + 6 y = - 24

6 x = 60

g(-2)=-3/2 (2)^{-2}

g (- 2) = - \frac{3}{2} (2)^{- 2}

solvefor x,3x-4y+4=0

so l v e f or x, 3 x - 4 y + 4 = 0