(12+2x)(8+2x)=129

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Solution for (12+2x)(8+2x)=129 equation:


Simplifying
(12 + 2x)(8 + 2x) = 129

Multiply (12 + 2x) * (8 + 2x)
(12(8 + 2x) + 2x * (8 + 2x)) = 129
((8 * 12 + 2x * 12) + 2x * (8 + 2x)) = 129
((96 + 24x) + 2x * (8 + 2x)) = 129
(96 + 24x + (8 * 2x + 2x * 2x)) = 129
(96 + 24x + (16x + 4x2)) = 129

Combine like terms: 24x + 16x = 40x
(96 + 40x + 4x2) = 129

Solving
96 + 40x + 4x2 = 129

Solving for variable 'x'.

Reorder the terms:
96 + -129 + 40x + 4x2 = 129 + -129

Combine like terms: 96 + -129 = -33
-33 + 40x + 4x2 = 129 + -129

Combine like terms: 129 + -129 = 0
-33 + 40x + 4x2 = 0

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

Divide each side by '4'.
-8.25 + 10x + x2 = 0

Move the constant term to the right:

Add '8.25' to each side of the equation.
-8.25 + 10x + 8.25 + x2 = 0 + 8.25

Reorder the terms:
-8.25 + 8.25 + 10x + x2 = 0 + 8.25

Combine like terms: -8.25 + 8.25 = 0.00
0.00 + 10x + x2 = 0 + 8.25
10x + x2 = 0 + 8.25

Combine like terms: 0 + 8.25 = 8.25
10x + x2 = 8.25

The x term is 10x.  Take half its coefficient (5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
10x + 25 + x2 = 8.25 + 25

Reorder the terms:
25 + 10x + x2 = 8.25 + 25

Combine like terms: 8.25 + 25 = 33.25
25 + 10x + x2 = 33.25

Factor a perfect square on the left side:
(x + 5)(x + 5) = 33.25

Calculate the square root of the right side: 5.766281297

Break this problem into two subproblems by setting 
(x + 5) equal to 5.766281297 and -5.766281297.

Subproblem 1

x + 5 = 5.766281297 Simplifying x + 5 = 5.766281297 Reorder the terms: 5 + x = 5.766281297 Solving 5 + x = 5.766281297 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + x = 5.766281297 + -5 Combine like terms: 5 + -5 = 0 0 + x = 5.766281297 + -5 x = 5.766281297 + -5 Combine like terms: 5.766281297 + -5 = 0.766281297 x = 0.766281297 Simplifying x = 0.766281297

Subproblem 2

x + 5 = -5.766281297 Simplifying x + 5 = -5.766281297 Reorder the terms: 5 + x = -5.766281297 Solving 5 + x = -5.766281297 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + x = -5.766281297 + -5 Combine like terms: 5 + -5 = 0 0 + x = -5.766281297 + -5 x = -5.766281297 + -5 Combine like terms: -5.766281297 + -5 = -10.766281297 x = -10.766281297 Simplifying x = -10.766281297

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.766281297, -10.766281297}

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