(x+4)+(x+4)=x^2+12x

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Solution for (x+4)+(x+4)=x^2+12x equation:


Simplifying
(x + 4) + (x + 4) = x2 + 12x

Reorder the terms:
(4 + x) + (x + 4) = x2 + 12x

Remove parenthesis around (4 + x)
4 + x + (x + 4) = x2 + 12x

Reorder the terms:
4 + x + (4 + x) = x2 + 12x

Remove parenthesis around (4 + x)
4 + x + 4 + x = x2 + 12x

Reorder the terms:
4 + 4 + x + x = x2 + 12x

Combine like terms: 4 + 4 = 8
8 + x + x = x2 + 12x

Combine like terms: x + x = 2x
8 + 2x = x2 + 12x

Reorder the terms:
8 + 2x = 12x + x2

Solving
8 + 2x = 12x + x2

Solving for variable 'x'.

Combine like terms: 2x + -12x = -10x
8 + -10x + -1x2 = 12x + x2 + -12x + -1x2

Reorder the terms:
8 + -10x + -1x2 = 12x + -12x + x2 + -1x2

Combine like terms: 12x + -12x = 0
8 + -10x + -1x2 = 0 + x2 + -1x2
8 + -10x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
8 + -10x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-8 + 10x + x2 = 0

Move the constant term to the right:

Add '8' to each side of the equation.
-8 + 10x + 8 + x2 = 0 + 8

Reorder the terms:
-8 + 8 + 10x + x2 = 0 + 8

Combine like terms: -8 + 8 = 0
0 + 10x + x2 = 0 + 8
10x + x2 = 0 + 8

Combine like terms: 0 + 8 = 8
10x + x2 = 8

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

Reorder the terms:
25 + 10x + x2 = 8 + 25

Combine like terms: 8 + 25 = 33
25 + 10x + x2 = 33

Factor a perfect square on the left side:
(x + 5)(x + 5) = 33

Calculate the square root of the right side: 5.744562647

Break this problem into two subproblems by setting 
(x + 5) equal to 5.744562647 and -5.744562647.

Subproblem 1

x + 5 = 5.744562647 Simplifying x + 5 = 5.744562647 Reorder the terms: 5 + x = 5.744562647 Solving 5 + x = 5.744562647 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 = 5.744562647 + -5 Combine like terms: 5 + -5 = 0 0 + x = 5.744562647 + -5 x = 5.744562647 + -5 Combine like terms: 5.744562647 + -5 = 0.744562647 x = 0.744562647 Simplifying x = 0.744562647

Subproblem 2

x + 5 = -5.744562647 Simplifying x + 5 = -5.744562647 Reorder the terms: 5 + x = -5.744562647 Solving 5 + x = -5.744562647 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 = -5.744562647 + -5 Combine like terms: 5 + -5 = 0 0 + x = -5.744562647 + -5 x = -5.744562647 + -5 Combine like terms: -5.744562647 + -5 = -10.744562647 x = -10.744562647 Simplifying x = -10.744562647

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.744562647, -10.744562647}

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