(2x^2)-(13x)=1

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Solution for (2x^2)-(13x)=1 equation:


Simplifying
(2x2) + -1(13x) = 1

Remove parenthesis around (13x)
(2x2) + -1 * 13x = 1

Multiply -1 * 13
(2x2) + -13x = 1

Reorder the terms:
-13x + (2x2) = 1

Solving
-13x + (2x2) = 1

Solving for variable 'x'.

Reorder the terms:
-1 + -13x + (2x2) = 1 + -1

Combine like terms: 1 + -1 = 0
-1 + -13x + (2x2) = 0

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

Divide each side by '2'.
-0.5 + -6.5x + x2 = 0

Move the constant term to the right:

Add '0.5' to each side of the equation.
-0.5 + -6.5x + 0.5 + x2 = 0 + 0.5

Reorder the terms:
-0.5 + 0.5 + -6.5x + x2 = 0 + 0.5

Combine like terms: -0.5 + 0.5 = 0.0
0.0 + -6.5x + x2 = 0 + 0.5
-6.5x + x2 = 0 + 0.5

Combine like terms: 0 + 0.5 = 0.5
-6.5x + x2 = 0.5

The x term is -6.5x.  Take half its coefficient (-3.25).
Square it (10.5625) and add it to both sides.

Add '10.5625' to each side of the equation.
-6.5x + 10.5625 + x2 = 0.5 + 10.5625

Reorder the terms:
10.5625 + -6.5x + x2 = 0.5 + 10.5625

Combine like terms: 0.5 + 10.5625 = 11.0625
10.5625 + -6.5x + x2 = 11.0625

Factor a perfect square on the left side:
((x) + -3.25)((x) + -3.25) = 11.0625

Calculate the square root of the right side: 3.326033674

Break this problem into two subproblems by setting 
((x) + -3.25) equal to 3.326033674 and -3.326033674.

Subproblem 1

(x) + -3.25 = 3.326033674 Simplifying (x) + -3.25 = 3.326033674 x + -3.25 = 3.326033674 Reorder the terms: -3.25 + x = 3.326033674 Solving -3.25 + x = 3.326033674 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.25' to each side of the equation. -3.25 + 3.25 + x = 3.326033674 + 3.25 Combine like terms: -3.25 + 3.25 = 0.00 0.00 + x = 3.326033674 + 3.25 x = 3.326033674 + 3.25 Combine like terms: 3.326033674 + 3.25 = 6.576033674 x = 6.576033674 Simplifying x = 6.576033674

Subproblem 2

(x) + -3.25 = -3.326033674 Simplifying (x) + -3.25 = -3.326033674 x + -3.25 = -3.326033674 Reorder the terms: -3.25 + x = -3.326033674 Solving -3.25 + x = -3.326033674 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.25' to each side of the equation. -3.25 + 3.25 + x = -3.326033674 + 3.25 Combine like terms: -3.25 + 3.25 = 0.00 0.00 + x = -3.326033674 + 3.25 x = -3.326033674 + 3.25 Combine like terms: -3.326033674 + 3.25 = -0.076033674 x = -0.076033674 Simplifying x = -0.076033674

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.576033674, -0.076033674}

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