2x(13+x)=41+x

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Solution for 2x(13+x)=41+x equation:


Simplifying
2x(13 + x) = 41 + x
(13 * 2x + x * 2x) = 41 + x
(26x + 2x2) = 41 + x

Solving
26x + 2x2 = 41 + x

Solving for variable 'x'.

Reorder the terms:
-41 + 26x + -1x + 2x2 = 41 + x + -41 + -1x

Combine like terms: 26x + -1x = 25x
-41 + 25x + 2x2 = 41 + x + -41 + -1x

Reorder the terms:
-41 + 25x + 2x2 = 41 + -41 + x + -1x

Combine like terms: 41 + -41 = 0
-41 + 25x + 2x2 = 0 + x + -1x
-41 + 25x + 2x2 = x + -1x

Combine like terms: x + -1x = 0
-41 + 25x + 2x2 = 0

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

Divide each side by '2'.
-20.5 + 12.5x + x2 = 0

Move the constant term to the right:

Add '20.5' to each side of the equation.
-20.5 + 12.5x + 20.5 + x2 = 0 + 20.5

Reorder the terms:
-20.5 + 20.5 + 12.5x + x2 = 0 + 20.5

Combine like terms: -20.5 + 20.5 = 0.0
0.0 + 12.5x + x2 = 0 + 20.5
12.5x + x2 = 0 + 20.5

Combine like terms: 0 + 20.5 = 20.5
12.5x + x2 = 20.5

The x term is 12.5x.  Take half its coefficient (6.25).
Square it (39.0625) and add it to both sides.

Add '39.0625' to each side of the equation.
12.5x + 39.0625 + x2 = 20.5 + 39.0625

Reorder the terms:
39.0625 + 12.5x + x2 = 20.5 + 39.0625

Combine like terms: 20.5 + 39.0625 = 59.5625
39.0625 + 12.5x + x2 = 59.5625

Factor a perfect square on the left side:
(x + 6.25)(x + 6.25) = 59.5625

Calculate the square root of the right side: 7.71767452

Break this problem into two subproblems by setting 
(x + 6.25) equal to 7.71767452 and -7.71767452.

Subproblem 1

x + 6.25 = 7.71767452 Simplifying x + 6.25 = 7.71767452 Reorder the terms: 6.25 + x = 7.71767452 Solving 6.25 + x = 7.71767452 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6.25' to each side of the equation. 6.25 + -6.25 + x = 7.71767452 + -6.25 Combine like terms: 6.25 + -6.25 = 0.00 0.00 + x = 7.71767452 + -6.25 x = 7.71767452 + -6.25 Combine like terms: 7.71767452 + -6.25 = 1.46767452 x = 1.46767452 Simplifying x = 1.46767452

Subproblem 2

x + 6.25 = -7.71767452 Simplifying x + 6.25 = -7.71767452 Reorder the terms: 6.25 + x = -7.71767452 Solving 6.25 + x = -7.71767452 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6.25' to each side of the equation. 6.25 + -6.25 + x = -7.71767452 + -6.25 Combine like terms: 6.25 + -6.25 = 0.00 0.00 + x = -7.71767452 + -6.25 x = -7.71767452 + -6.25 Combine like terms: -7.71767452 + -6.25 = -13.96767452 x = -13.96767452 Simplifying x = -13.96767452

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.46767452, -13.96767452}

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