4x(2x-2)=128

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Solution for 4x(2x-2)=128 equation: 


Simplifying
4x(2x + -2) = 128

Reorder the terms:
4x(-2 + 2x) = 128
(-2 * 4x + 2x * 4x) = 128
(-8x + 8x2) = 128

Solving
-8x + 8x2 = 128

Solving for variable 'x'.

Reorder the terms:
-128 + -8x + 8x2 = 128 + -128

Combine like terms: 128 + -128 = 0
-128 + -8x + 8x2 = 0

Factor out the Greatest Common Factor (GCF), '8'.
8(-16 + -1x + x2) = 0

Ignore the factor 8.

Subproblem 1
Set the factor '(-16 + -1x + x2)' equal to zero and attempt to solve:

Simplifying
-16 + -1x + x2 = 0

Solving
-16 + -1x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '16' to each side of the equation.
-16 + -1x + 16 + x2 = 0 + 16

Reorder the terms:
-16 + 16 + -1x + x2 = 0 + 16

Combine like terms: -16 + 16 = 0
0 + -1x + x2 = 0 + 16
-1x + x2 = 0 + 16

Combine like terms: 0 + 16 = 16
-1x + x2 = 16

The x term is -1x.  Take half its coefficient (-0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
-1x + 0.25 + x2 = 16 + 0.25

Reorder the terms:
0.25 + -1x + x2 = 16 + 0.25

Combine like terms: 16 + 0.25 = 16.25
0.25 + -1x + x2 = 16.25

Factor a perfect square on the left side:
(x + -0.5)(x + -0.5) = 16.25

Calculate the square root of the right side: 4.031128874

Break this problem into two subproblems by setting 
(x + -0.5) equal to 4.031128874 and -4.031128874.


Subproblem 1
x + -0.5 = 4.031128874

Simplifying
x + -0.5 = 4.031128874

Reorder the terms:
-0.5 + x = 4.031128874

Solving
-0.5 + x = 4.031128874

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '0.5' to each side of the equation.
-0.5 + 0.5 + x = 4.031128874 + 0.5

Combine like terms: -0.5 + 0.5 = 0.0
0.0 + x = 4.031128874 + 0.5
x = 4.031128874 + 0.5

Combine like terms: 4.031128874 + 0.5 = 4.531128874
x = 4.531128874

Simplifying
x = 4.531128874


Subproblem 2
x + -0.5 = -4.031128874

Simplifying
x + -0.5 = -4.031128874

Reorder the terms:
-0.5 + x = -4.031128874

Solving
-0.5 + x = -4.031128874

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '0.5' to each side of the equation.
-0.5 + 0.5 + x = -4.031128874 + 0.5

Combine like terms: -0.5 + 0.5 = 0.0
0.0 + x = -4.031128874 + 0.5
x = -4.031128874 + 0.5

Combine like terms: -4.031128874 + 0.5 = -3.531128874
x = -3.531128874

Simplifying
x = -3.531128874


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {4.531128874, -3.531128874}
Solution
x = {4.531128874, -3.531128874}

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