(8-2x)(8-2x)-x=0

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Solution for (8-2x)(8-2x)-x=0 equation:


Simplifying
(8 + -2x)(8 + -2x) + -1x = 0

Multiply (8 + -2x) * (8 + -2x)
(8(8 + -2x) + -2x * (8 + -2x)) + -1x = 0
((8 * 8 + -2x * 8) + -2x * (8 + -2x)) + -1x = 0
((64 + -16x) + -2x * (8 + -2x)) + -1x = 0
(64 + -16x + (8 * -2x + -2x * -2x)) + -1x = 0
(64 + -16x + (-16x + 4x2)) + -1x = 0

Combine like terms: -16x + -16x = -32x
(64 + -32x + 4x2) + -1x = 0

Reorder the terms:
64 + -32x + -1x + 4x2 = 0

Combine like terms: -32x + -1x = -33x
64 + -33x + 4x2 = 0

Solving
64 + -33x + 4x2 = 0

Solving for variable 'x'.

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

Divide each side by '4'.
16 + -8.25x + x2 = 0

Move the constant term to the right:

Add '-16' to each side of the equation.
16 + -8.25x + -16 + x2 = 0 + -16

Reorder the terms:
16 + -16 + -8.25x + x2 = 0 + -16

Combine like terms: 16 + -16 = 0
0 + -8.25x + x2 = 0 + -16
-8.25x + x2 = 0 + -16

Combine like terms: 0 + -16 = -16
-8.25x + x2 = -16

The x term is -8.25x.  Take half its coefficient (-4.125).
Square it (17.015625) and add it to both sides.

Add '17.015625' to each side of the equation.
-8.25x + 17.015625 + x2 = -16 + 17.015625

Reorder the terms:
17.015625 + -8.25x + x2 = -16 + 17.015625

Combine like terms: -16 + 17.015625 = 1.015625
17.015625 + -8.25x + x2 = 1.015625

Factor a perfect square on the left side:
(x + -4.125)(x + -4.125) = 1.015625

Calculate the square root of the right side: 1.007782219

Break this problem into two subproblems by setting 
(x + -4.125) equal to 1.007782219 and -1.007782219.

Subproblem 1

x + -4.125 = 1.007782219 Simplifying x + -4.125 = 1.007782219 Reorder the terms: -4.125 + x = 1.007782219 Solving -4.125 + x = 1.007782219 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4.125' to each side of the equation. -4.125 + 4.125 + x = 1.007782219 + 4.125 Combine like terms: -4.125 + 4.125 = 0.000 0.000 + x = 1.007782219 + 4.125 x = 1.007782219 + 4.125 Combine like terms: 1.007782219 + 4.125 = 5.132782219 x = 5.132782219 Simplifying x = 5.132782219

Subproblem 2

x + -4.125 = -1.007782219 Simplifying x + -4.125 = -1.007782219 Reorder the terms: -4.125 + x = -1.007782219 Solving -4.125 + x = -1.007782219 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4.125' to each side of the equation. -4.125 + 4.125 + x = -1.007782219 + 4.125 Combine like terms: -4.125 + 4.125 = 0.000 0.000 + x = -1.007782219 + 4.125 x = -1.007782219 + 4.125 Combine like terms: -1.007782219 + 4.125 = 3.117217781 x = 3.117217781 Simplifying x = 3.117217781

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.132782219, 3.117217781}

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