3x(x-2)-(2x+2)=0

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Solution for 3x(x-2)-(2x+2)=0 equation:


Simplifying
3x(x + -2) + -1(2x + 2) = 0

Reorder the terms:
3x(-2 + x) + -1(2x + 2) = 0
(-2 * 3x + x * 3x) + -1(2x + 2) = 0
(-6x + 3x2) + -1(2x + 2) = 0

Reorder the terms:
-6x + 3x2 + -1(2 + 2x) = 0
-6x + 3x2 + (2 * -1 + 2x * -1) = 0
-6x + 3x2 + (-2 + -2x) = 0

Reorder the terms:
-2 + -6x + -2x + 3x2 = 0

Combine like terms: -6x + -2x = -8x
-2 + -8x + 3x2 = 0

Solving
-2 + -8x + 3x2 = 0

Solving for variable 'x'.

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

Divide each side by '3'.
-0.6666666667 + -2.666666667x + x2 = 0

Move the constant term to the right:

Add '0.6666666667' to each side of the equation.
-0.6666666667 + -2.666666667x + 0.6666666667 + x2 = 0 + 0.6666666667

Reorder the terms:
-0.6666666667 + 0.6666666667 + -2.666666667x + x2 = 0 + 0.6666666667

Combine like terms: -0.6666666667 + 0.6666666667 = 0.0000000000
0.0000000000 + -2.666666667x + x2 = 0 + 0.6666666667
-2.666666667x + x2 = 0 + 0.6666666667

Combine like terms: 0 + 0.6666666667 = 0.6666666667
-2.666666667x + x2 = 0.6666666667

The x term is -2.666666667x.  Take half its coefficient (-1.333333334).
Square it (1.777777780) and add it to both sides.

Add '1.777777780' to each side of the equation.
-2.666666667x + 1.777777780 + x2 = 0.6666666667 + 1.777777780

Reorder the terms:
1.777777780 + -2.666666667x + x2 = 0.6666666667 + 1.777777780

Combine like terms: 0.6666666667 + 1.777777780 = 2.4444444467
1.777777780 + -2.666666667x + x2 = 2.4444444467

Factor a perfect square on the left side:
(x + -1.333333334)(x + -1.333333334) = 2.4444444467

Calculate the square root of the right side: 1.563471921

Break this problem into two subproblems by setting 
(x + -1.333333334) equal to 1.563471921 and -1.563471921.

Subproblem 1

x + -1.333333334 = 1.563471921 Simplifying x + -1.333333334 = 1.563471921 Reorder the terms: -1.333333334 + x = 1.563471921 Solving -1.333333334 + x = 1.563471921 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.333333334' to each side of the equation. -1.333333334 + 1.333333334 + x = 1.563471921 + 1.333333334 Combine like terms: -1.333333334 + 1.333333334 = 0.000000000 0.000000000 + x = 1.563471921 + 1.333333334 x = 1.563471921 + 1.333333334 Combine like terms: 1.563471921 + 1.333333334 = 2.896805255 x = 2.896805255 Simplifying x = 2.896805255

Subproblem 2

x + -1.333333334 = -1.563471921 Simplifying x + -1.333333334 = -1.563471921 Reorder the terms: -1.333333334 + x = -1.563471921 Solving -1.333333334 + x = -1.563471921 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.333333334' to each side of the equation. -1.333333334 + 1.333333334 + x = -1.563471921 + 1.333333334 Combine like terms: -1.333333334 + 1.333333334 = 0.000000000 0.000000000 + x = -1.563471921 + 1.333333334 x = -1.563471921 + 1.333333334 Combine like terms: -1.563471921 + 1.333333334 = -0.230138587 x = -0.230138587 Simplifying x = -0.230138587

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.896805255, -0.230138587}

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