0=13x^2-x-2

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Solution for 0=13x^2-x-2 equation:


Simplifying
0 = 13x2 + -1x + -2

Reorder the terms:
0 = -2 + -1x + 13x2

Solving
0 = -2 + -1x + 13x2

Solving for variable 'x'.

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

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

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

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

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

Begin completing the square.  Divide all terms by
-13 the coefficient of the squared term: 

Divide each side by '-13'.
-0.1538461538 + -0.07692307692x + x2 = 0

Move the constant term to the right:

Add '0.1538461538' to each side of the equation.
-0.1538461538 + -0.07692307692x + 0.1538461538 + x2 = 0 + 0.1538461538

Reorder the terms:
-0.1538461538 + 0.1538461538 + -0.07692307692x + x2 = 0 + 0.1538461538

Combine like terms: -0.1538461538 + 0.1538461538 = 0.0000000000
0.0000000000 + -0.07692307692x + x2 = 0 + 0.1538461538
-0.07692307692x + x2 = 0 + 0.1538461538

Combine like terms: 0 + 0.1538461538 = 0.1538461538
-0.07692307692x + x2 = 0.1538461538

The x term is x.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
-0.07692307692x + 0.25 + x2 = 0.1538461538 + 0.25

Reorder the terms:
0.25 + -0.07692307692x + x2 = 0.1538461538 + 0.25

Combine like terms: 0.1538461538 + 0.25 = 0.4038461538
0.25 + -0.07692307692x + x2 = 0.4038461538

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 0.4038461538

Calculate the square root of the right side: 0.635488909

Break this problem into two subproblems by setting 
(x + 0.5) equal to 0.635488909 and -0.635488909.

Subproblem 1

x + 0.5 = 0.635488909 Simplifying x + 0.5 = 0.635488909 Reorder the terms: 0.5 + x = 0.635488909 Solving 0.5 + x = 0.635488909 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = 0.635488909 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 0.635488909 + -0.5 x = 0.635488909 + -0.5 Combine like terms: 0.635488909 + -0.5 = 0.135488909 x = 0.135488909 Simplifying x = 0.135488909

Subproblem 2

x + 0.5 = -0.635488909 Simplifying x + 0.5 = -0.635488909 Reorder the terms: 0.5 + x = -0.635488909 Solving 0.5 + x = -0.635488909 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = -0.635488909 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -0.635488909 + -0.5 x = -0.635488909 + -0.5 Combine like terms: -0.635488909 + -0.5 = -1.135488909 x = -1.135488909 Simplifying x = -1.135488909

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.135488909, -1.135488909}

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