-2x(x-2)-4x=3(x+1)-9x

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Solution for -2x(x-2)-4x=3(x+1)-9x equation:


Simplifying
-2x(x + -2) + -4x = 3(x + 1) + -9x

Reorder the terms:
-2x(-2 + x) + -4x = 3(x + 1) + -9x
(-2 * -2x + x * -2x) + -4x = 3(x + 1) + -9x
(4x + -2x2) + -4x = 3(x + 1) + -9x

Reorder the terms:
4x + -4x + -2x2 = 3(x + 1) + -9x

Combine like terms: 4x + -4x = 0
0 + -2x2 = 3(x + 1) + -9x
-2x2 = 3(x + 1) + -9x

Reorder the terms:
-2x2 = 3(1 + x) + -9x
-2x2 = (1 * 3 + x * 3) + -9x
-2x2 = (3 + 3x) + -9x

Combine like terms: 3x + -9x = -6x
-2x2 = 3 + -6x

Solving
-2x2 = 3 + -6x

Solving for variable 'x'.

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

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

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

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

Begin completing the square.  Divide all terms by
-2 the coefficient of the squared term: 

Divide each side by '-2'.
1.5 + -3x + x2 = 0

Move the constant term to the right:

Add '-1.5' to each side of the equation.
1.5 + -3x + -1.5 + x2 = 0 + -1.5

Reorder the terms:
1.5 + -1.5 + -3x + x2 = 0 + -1.5

Combine like terms: 1.5 + -1.5 = 0.0
0.0 + -3x + x2 = 0 + -1.5
-3x + x2 = 0 + -1.5

Combine like terms: 0 + -1.5 = -1.5
-3x + x2 = -1.5

The x term is -3x.  Take half its coefficient (-1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
-3x + 2.25 + x2 = -1.5 + 2.25

Reorder the terms:
2.25 + -3x + x2 = -1.5 + 2.25

Combine like terms: -1.5 + 2.25 = 0.75
2.25 + -3x + x2 = 0.75

Factor a perfect square on the left side:
(x + -1.5)(x + -1.5) = 0.75

Calculate the square root of the right side: 0.866025404

Break this problem into two subproblems by setting 
(x + -1.5) equal to 0.866025404 and -0.866025404.

Subproblem 1

x + -1.5 = 0.866025404 Simplifying x + -1.5 = 0.866025404 Reorder the terms: -1.5 + x = 0.866025404 Solving -1.5 + x = 0.866025404 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = 0.866025404 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = 0.866025404 + 1.5 x = 0.866025404 + 1.5 Combine like terms: 0.866025404 + 1.5 = 2.366025404 x = 2.366025404 Simplifying x = 2.366025404

Subproblem 2

x + -1.5 = -0.866025404 Simplifying x + -1.5 = -0.866025404 Reorder the terms: -1.5 + x = -0.866025404 Solving -1.5 + x = -0.866025404 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = -0.866025404 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = -0.866025404 + 1.5 x = -0.866025404 + 1.5 Combine like terms: -0.866025404 + 1.5 = 0.633974596 x = 0.633974596 Simplifying x = 0.633974596

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.366025404, 0.633974596}

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