2x^2-13x=5

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Solution for 2x^2-13x=5 equation:


Simplifying
2x2 + -13x = 5

Reorder the terms:
-13x + 2x2 = 5

Solving
-13x + 2x2 = 5

Solving for variable 'x'.

Reorder the terms:
-5 + -13x + 2x2 = 5 + -5

Combine like terms: 5 + -5 = 0
-5 + -13x + 2x2 = 0

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

Divide each side by '2'.
-2.5 + -6.5x + x2 = 0

Move the constant term to the right:

Add '2.5' to each side of the equation.
-2.5 + -6.5x + 2.5 + x2 = 0 + 2.5

Reorder the terms:
-2.5 + 2.5 + -6.5x + x2 = 0 + 2.5

Combine like terms: -2.5 + 2.5 = 0.0
0.0 + -6.5x + x2 = 0 + 2.5
-6.5x + x2 = 0 + 2.5

Combine like terms: 0 + 2.5 = 2.5
-6.5x + x2 = 2.5

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 = 2.5 + 10.5625

Reorder the terms:
10.5625 + -6.5x + x2 = 2.5 + 10.5625

Combine like terms: 2.5 + 10.5625 = 13.0625
10.5625 + -6.5x + x2 = 13.0625

Factor a perfect square on the left side:
(x + -3.25)(x + -3.25) = 13.0625

Calculate the square root of the right side: 3.614208074

Break this problem into two subproblems by setting 
(x + -3.25) equal to 3.614208074 and -3.614208074.

Subproblem 1

x + -3.25 = 3.614208074 Simplifying x + -3.25 = 3.614208074 Reorder the terms: -3.25 + x = 3.614208074 Solving -3.25 + x = 3.614208074 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 = 3.614208074 + 3.25 Combine like terms: -3.25 + 3.25 = 0.00 0.00 + x = 3.614208074 + 3.25 x = 3.614208074 + 3.25 Combine like terms: 3.614208074 + 3.25 = 6.864208074 x = 6.864208074 Simplifying x = 6.864208074

Subproblem 2

x + -3.25 = -3.614208074 Simplifying x + -3.25 = -3.614208074 Reorder the terms: -3.25 + x = -3.614208074 Solving -3.25 + x = -3.614208074 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 = -3.614208074 + 3.25 Combine like terms: -3.25 + 3.25 = 0.00 0.00 + x = -3.614208074 + 3.25 x = -3.614208074 + 3.25 Combine like terms: -3.614208074 + 3.25 = -0.364208074 x = -0.364208074 Simplifying x = -0.364208074

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.864208074, -0.364208074}

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