(2x+13)(2x+13)=8

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Solution for (2x+13)(2x+13)=8 equation:


Simplifying
(2x + 13)(2x + 13) = 8

Reorder the terms:
(13 + 2x)(2x + 13) = 8

Reorder the terms:
(13 + 2x)(13 + 2x) = 8

Multiply (13 + 2x) * (13 + 2x)
(13(13 + 2x) + 2x * (13 + 2x)) = 8
((13 * 13 + 2x * 13) + 2x * (13 + 2x)) = 8
((169 + 26x) + 2x * (13 + 2x)) = 8
(169 + 26x + (13 * 2x + 2x * 2x)) = 8
(169 + 26x + (26x + 4x2)) = 8

Combine like terms: 26x + 26x = 52x
(169 + 52x + 4x2) = 8

Solving
169 + 52x + 4x2 = 8

Solving for variable 'x'.

Reorder the terms:
169 + -8 + 52x + 4x2 = 8 + -8

Combine like terms: 169 + -8 = 161
161 + 52x + 4x2 = 8 + -8

Combine like terms: 8 + -8 = 0
161 + 52x + 4x2 = 0

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

Divide each side by '4'.
40.25 + 13x + x2 = 0

Move the constant term to the right:

Add '-40.25' to each side of the equation.
40.25 + 13x + -40.25 + x2 = 0 + -40.25

Reorder the terms:
40.25 + -40.25 + 13x + x2 = 0 + -40.25

Combine like terms: 40.25 + -40.25 = 0.00
0.00 + 13x + x2 = 0 + -40.25
13x + x2 = 0 + -40.25

Combine like terms: 0 + -40.25 = -40.25
13x + x2 = -40.25

The x term is 13x.  Take half its coefficient (6.5).
Square it (42.25) and add it to both sides.

Add '42.25' to each side of the equation.
13x + 42.25 + x2 = -40.25 + 42.25

Reorder the terms:
42.25 + 13x + x2 = -40.25 + 42.25

Combine like terms: -40.25 + 42.25 = 2
42.25 + 13x + x2 = 2

Factor a perfect square on the left side:
(x + 6.5)(x + 6.5) = 2

Calculate the square root of the right side: 1.414213562

Break this problem into two subproblems by setting 
(x + 6.5) equal to 1.414213562 and -1.414213562.

Subproblem 1

x + 6.5 = 1.414213562 Simplifying x + 6.5 = 1.414213562 Reorder the terms: 6.5 + x = 1.414213562 Solving 6.5 + x = 1.414213562 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6.5' to each side of the equation. 6.5 + -6.5 + x = 1.414213562 + -6.5 Combine like terms: 6.5 + -6.5 = 0.0 0.0 + x = 1.414213562 + -6.5 x = 1.414213562 + -6.5 Combine like terms: 1.414213562 + -6.5 = -5.085786438 x = -5.085786438 Simplifying x = -5.085786438

Subproblem 2

x + 6.5 = -1.414213562 Simplifying x + 6.5 = -1.414213562 Reorder the terms: 6.5 + x = -1.414213562 Solving 6.5 + x = -1.414213562 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6.5' to each side of the equation. 6.5 + -6.5 + x = -1.414213562 + -6.5 Combine like terms: 6.5 + -6.5 = 0.0 0.0 + x = -1.414213562 + -6.5 x = -1.414213562 + -6.5 Combine like terms: -1.414213562 + -6.5 = -7.914213562 x = -7.914213562 Simplifying x = -7.914213562

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-5.085786438, -7.914213562}

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