36x^2-x-1=0

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Solution for 36x^2-x-1=0 equation:


Simplifying
36x2 + -1x + -1 = 0

Reorder the terms:
-1 + -1x + 36x2 = 0

Solving
-1 + -1x + 36x2 = 0

Solving for variable 'x'.

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

Divide each side by '36'.
-0.02777777778 + -0.02777777778x + x2 = 0

Move the constant term to the right:

Add '0.02777777778' to each side of the equation.
-0.02777777778 + -0.02777777778x + 0.02777777778 + x2 = 0 + 0.02777777778

Reorder the terms:
-0.02777777778 + 0.02777777778 + -0.02777777778x + x2 = 0 + 0.02777777778

Combine like terms: -0.02777777778 + 0.02777777778 = 0.00000000000
0.00000000000 + -0.02777777778x + x2 = 0 + 0.02777777778
-0.02777777778x + x2 = 0 + 0.02777777778

Combine like terms: 0 + 0.02777777778 = 0.02777777778
-0.02777777778x + x2 = 0.02777777778

The x term is -0.02777777778x.  Take half its coefficient (-0.01388888889).
Square it (0.0001929012346) and add it to both sides.

Add '0.0001929012346' to each side of the equation.
-0.02777777778x + 0.0001929012346 + x2 = 0.02777777778 + 0.0001929012346

Reorder the terms:
0.0001929012346 + -0.02777777778x + x2 = 0.02777777778 + 0.0001929012346

Combine like terms: 0.02777777778 + 0.0001929012346 = 0.0279706790146
0.0001929012346 + -0.02777777778x + x2 = 0.0279706790146

Factor a perfect square on the left side:
(x + -0.01388888889)(x + -0.01388888889) = 0.0279706790146

Calculate the square root of the right side: 0.167244369

Break this problem into two subproblems by setting 
(x + -0.01388888889) equal to 0.167244369 and -0.167244369.

Subproblem 1

x + -0.01388888889 = 0.167244369 Simplifying x + -0.01388888889 = 0.167244369 Reorder the terms: -0.01388888889 + x = 0.167244369 Solving -0.01388888889 + x = 0.167244369 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.01388888889' to each side of the equation. -0.01388888889 + 0.01388888889 + x = 0.167244369 + 0.01388888889 Combine like terms: -0.01388888889 + 0.01388888889 = 0.00000000000 0.00000000000 + x = 0.167244369 + 0.01388888889 x = 0.167244369 + 0.01388888889 Combine like terms: 0.167244369 + 0.01388888889 = 0.18113325789 x = 0.18113325789 Simplifying x = 0.18113325789

Subproblem 2

x + -0.01388888889 = -0.167244369 Simplifying x + -0.01388888889 = -0.167244369 Reorder the terms: -0.01388888889 + x = -0.167244369 Solving -0.01388888889 + x = -0.167244369 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.01388888889' to each side of the equation. -0.01388888889 + 0.01388888889 + x = -0.167244369 + 0.01388888889 Combine like terms: -0.01388888889 + 0.01388888889 = 0.00000000000 0.00000000000 + x = -0.167244369 + 0.01388888889 x = -0.167244369 + 0.01388888889 Combine like terms: -0.167244369 + 0.01388888889 = -0.15335548011 x = -0.15335548011 Simplifying x = -0.15335548011

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.18113325789, -0.15335548011}

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