128=(x-4)(x-4)3

Solution for 128=(x-4)(x-4)3 equation:

Simplifying
128 = (x + -4)(x + -4) * 3

Reorder the terms:
128 = (-4 + x)(x + -4) * 3

Reorder the terms:
128 = (-4 + x)(-4 + x) * 3

Reorder the terms for easier multiplication:
128 = 3(-4 + x)(-4 + x)

Multiply (-4 + x) * (-4 + x)
128 = 3(-4(-4 + x) + x(-4 + x))
128 = 3((-4 * -4 + x * -4) + x(-4 + x))
128 = 3((16 + -4x) + x(-4 + x))
128 = 3(16 + -4x + (-4 * x + x * x))
128 = 3(16 + -4x + (-4x + x2))

Combine like terms: -4x + -4x = -8x
128 = 3(16 + -8x + x2)
128 = (16 * 3 + -8x * 3 + x2 * 3)
128 = (48 + -24x + 3x2)

Solving
128 = 48 + -24x + 3x2

Solving for variable 'x'.

Combine like terms: 128 + -48 = 80
80 + 24x + -3x2 = 48 + -24x + 3x2 + -48 + 24x + -3x2

Reorder the terms:
80 + 24x + -3x2 = 48 + -48 + -24x + 24x + 3x2 + -3x2

Combine like terms: 48 + -48 = 0
80 + 24x + -3x2 = 0 + -24x + 24x + 3x2 + -3x2
80 + 24x + -3x2 = -24x + 24x + 3x2 + -3x2

Combine like terms: -24x + 24x = 0
80 + 24x + -3x2 = 0 + 3x2 + -3x2
80 + 24x + -3x2 = 3x2 + -3x2

Combine like terms: 3x2 + -3x2 = 0
80 + 24x + -3x2 = 0

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

Divide each side by '-3'.
-26.66666667 + -8x + x2 = 0

Move the constant term to the right:

Add '26.66666667' to each side of the equation.
-26.66666667 + -8x + 26.66666667 + x2 = 0 + 26.66666667

Reorder the terms:
-26.66666667 + 26.66666667 + -8x + x2 = 0 + 26.66666667

Combine like terms: -26.66666667 + 26.66666667 = 0.00000000
0.00000000 + -8x + x2 = 0 + 26.66666667
-8x + x2 = 0 + 26.66666667

Combine like terms: 0 + 26.66666667 = 26.66666667
-8x + x2 = 26.66666667

The x term is -8x.  Take half its coefficient (-4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
-8x + 16 + x2 = 26.66666667 + 16

Reorder the terms:
16 + -8x + x2 = 26.66666667 + 16

Combine like terms: 26.66666667 + 16 = 42.66666667
16 + -8x + x2 = 42.66666667

Factor a perfect square on the left side:
(x + -4)(x + -4) = 42.66666667

Calculate the square root of the right side: 6.531972648

Break this problem into two subproblems by setting 
(x + -4) equal to 6.531972648 and -6.531972648.

Subproblem 1
x + -4 = 6.531972648

Simplifying
x + -4 = 6.531972648

Reorder the terms:
-4 + x = 6.531972648

Solving
-4 + x = 6.531972648

Solving for variable 'x'.

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

Add '4' to each side of the equation.
-4 + 4 + x = 6.531972648 + 4

Combine like terms: -4 + 4 = 0
0 + x = 6.531972648 + 4
x = 6.531972648 + 4

Combine like terms: 6.531972648 + 4 = 10.531972648
x = 10.531972648

Simplifying
x = 10.531972648

Subproblem 2
x + -4 = -6.531972648

Simplifying
x + -4 = -6.531972648

Reorder the terms:
-4 + x = -6.531972648

Solving
-4 + x = -6.531972648

Solving for variable 'x'.

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

Add '4' to each side of the equation.
-4 + 4 + x = -6.531972648 + 4

Combine like terms: -4 + 4 = 0
0 + x = -6.531972648 + 4
x = -6.531972648 + 4

Combine like terms: -6.531972648 + 4 = -2.531972648
x = -2.531972648

Simplifying
x = -2.531972648

Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {10.531972648, -2.531972648}