36x^2-21x-1=0

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Solution for 36x^2-21x-1=0 equation:


Simplifying
36x2 + -21x + -1 = 0

Reorder the terms:
-1 + -21x + 36x2 = 0

Solving
-1 + -21x + 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 + -0.5833333333x + x2 = 0

Move the constant term to the right:

Add '0.02777777778' to each side of the equation.
-0.02777777778 + -0.5833333333x + 0.02777777778 + x2 = 0 + 0.02777777778

Reorder the terms:
-0.02777777778 + 0.02777777778 + -0.5833333333x + x2 = 0 + 0.02777777778

Combine like terms: -0.02777777778 + 0.02777777778 = 0.00000000000
0.00000000000 + -0.5833333333x + x2 = 0 + 0.02777777778
-0.5833333333x + x2 = 0 + 0.02777777778

Combine like terms: 0 + 0.02777777778 = 0.02777777778
-0.5833333333x + x2 = 0.02777777778

The x term is -0.5833333333x.  Take half its coefficient (-0.2916666667).
Square it (0.08506944446) and add it to both sides.

Add '0.08506944446' to each side of the equation.
-0.5833333333x + 0.08506944446 + x2 = 0.02777777778 + 0.08506944446

Reorder the terms:
0.08506944446 + -0.5833333333x + x2 = 0.02777777778 + 0.08506944446

Combine like terms: 0.02777777778 + 0.08506944446 = 0.11284722224
0.08506944446 + -0.5833333333x + x2 = 0.11284722224

Factor a perfect square on the left side:
(x + -0.2916666667)(x + -0.2916666667) = 0.11284722224

Calculate the square root of the right side: 0.335927406

Break this problem into two subproblems by setting 
(x + -0.2916666667) equal to 0.335927406 and -0.335927406.

Subproblem 1

x + -0.2916666667 = 0.335927406 Simplifying x + -0.2916666667 = 0.335927406 Reorder the terms: -0.2916666667 + x = 0.335927406 Solving -0.2916666667 + x = 0.335927406 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.2916666667' to each side of the equation. -0.2916666667 + 0.2916666667 + x = 0.335927406 + 0.2916666667 Combine like terms: -0.2916666667 + 0.2916666667 = 0.0000000000 0.0000000000 + x = 0.335927406 + 0.2916666667 x = 0.335927406 + 0.2916666667 Combine like terms: 0.335927406 + 0.2916666667 = 0.6275940727 x = 0.6275940727 Simplifying x = 0.6275940727

Subproblem 2

x + -0.2916666667 = -0.335927406 Simplifying x + -0.2916666667 = -0.335927406 Reorder the terms: -0.2916666667 + x = -0.335927406 Solving -0.2916666667 + x = -0.335927406 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.2916666667' to each side of the equation. -0.2916666667 + 0.2916666667 + x = -0.335927406 + 0.2916666667 Combine like terms: -0.2916666667 + 0.2916666667 = 0.0000000000 0.0000000000 + x = -0.335927406 + 0.2916666667 x = -0.335927406 + 0.2916666667 Combine like terms: -0.335927406 + 0.2916666667 = -0.0442607393 x = -0.0442607393 Simplifying x = -0.0442607393

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.6275940727, -0.0442607393}

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