9x(x-2)=(x+2)

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Solution for 9x(x-2)=(x+2) equation:


Simplifying
9x(x + -2) = (x + 2)

Reorder the terms:
9x(-2 + x) = (x + 2)
(-2 * 9x + x * 9x) = (x + 2)
(-18x + 9x2) = (x + 2)

Reorder the terms:
-18x + 9x2 = (2 + x)

Remove parenthesis around (2 + x)
-18x + 9x2 = 2 + x

Solving
-18x + 9x2 = 2 + x

Solving for variable 'x'.

Reorder the terms:
-2 + -18x + -1x + 9x2 = 2 + x + -2 + -1x

Combine like terms: -18x + -1x = -19x
-2 + -19x + 9x2 = 2 + x + -2 + -1x

Reorder the terms:
-2 + -19x + 9x2 = 2 + -2 + x + -1x

Combine like terms: 2 + -2 = 0
-2 + -19x + 9x2 = 0 + x + -1x
-2 + -19x + 9x2 = x + -1x

Combine like terms: x + -1x = 0
-2 + -19x + 9x2 = 0

Begin completing the square.  Divide all terms by
9 the coefficient of the squared term: 

Divide each side by '9'.
-0.2222222222 + -2.111111111x + x2 = 0

Move the constant term to the right:

Add '0.2222222222' to each side of the equation.
-0.2222222222 + -2.111111111x + 0.2222222222 + x2 = 0 + 0.2222222222

Reorder the terms:
-0.2222222222 + 0.2222222222 + -2.111111111x + x2 = 0 + 0.2222222222

Combine like terms: -0.2222222222 + 0.2222222222 = 0.0000000000
0.0000000000 + -2.111111111x + x2 = 0 + 0.2222222222
-2.111111111x + x2 = 0 + 0.2222222222

Combine like terms: 0 + 0.2222222222 = 0.2222222222
-2.111111111x + x2 = 0.2222222222

The x term is -2.111111111x.  Take half its coefficient (-1.055555556).
Square it (1.114197532) and add it to both sides.

Add '1.114197532' to each side of the equation.
-2.111111111x + 1.114197532 + x2 = 0.2222222222 + 1.114197532

Reorder the terms:
1.114197532 + -2.111111111x + x2 = 0.2222222222 + 1.114197532

Combine like terms: 0.2222222222 + 1.114197532 = 1.3364197542
1.114197532 + -2.111111111x + x2 = 1.3364197542

Factor a perfect square on the left side:
(x + -1.055555556)(x + -1.055555556) = 1.3364197542

Calculate the square root of the right side: 1.156036225

Break this problem into two subproblems by setting 
(x + -1.055555556) equal to 1.156036225 and -1.156036225.

Subproblem 1

x + -1.055555556 = 1.156036225 Simplifying x + -1.055555556 = 1.156036225 Reorder the terms: -1.055555556 + x = 1.156036225 Solving -1.055555556 + x = 1.156036225 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.055555556' to each side of the equation. -1.055555556 + 1.055555556 + x = 1.156036225 + 1.055555556 Combine like terms: -1.055555556 + 1.055555556 = 0.000000000 0.000000000 + x = 1.156036225 + 1.055555556 x = 1.156036225 + 1.055555556 Combine like terms: 1.156036225 + 1.055555556 = 2.211591781 x = 2.211591781 Simplifying x = 2.211591781

Subproblem 2

x + -1.055555556 = -1.156036225 Simplifying x + -1.055555556 = -1.156036225 Reorder the terms: -1.055555556 + x = -1.156036225 Solving -1.055555556 + x = -1.156036225 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.055555556' to each side of the equation. -1.055555556 + 1.055555556 + x = -1.156036225 + 1.055555556 Combine like terms: -1.055555556 + 1.055555556 = 0.000000000 0.000000000 + x = -1.156036225 + 1.055555556 x = -1.156036225 + 1.055555556 Combine like terms: -1.156036225 + 1.055555556 = -0.100480669 x = -0.100480669 Simplifying x = -0.100480669

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.211591781, -0.100480669}

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