x^2+12x-1=0

Solution for x^2+12x-1=0 equation:

Simplifying
x2 + 12x + -1 = 0

Reorder the terms:
-1 + 12x + x2 = 0

Solving
-1 + 12x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '1' to each side of the equation.
-1 + 12x + 1 + x2 = 0 + 1

Reorder the terms:
-1 + 1 + 12x + x2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + 12x + x2 = 0 + 1
12x + x2 = 0 + 1

Combine like terms: 0 + 1 = 1
12x + x2 = 1

The x term is 12x.  Take half its coefficient (6).
Square it (36) and add it to both sides.

Add '36' to each side of the equation.
12x + 36 + x2 = 1 + 36

Reorder the terms:
36 + 12x + x2 = 1 + 36

Combine like terms: 1 + 36 = 37
36 + 12x + x2 = 37

Factor a perfect square on the left side:
(x + 6)(x + 6) = 37

Calculate the square root of the right side: 6.08276253

Break this problem into two subproblems by setting 
(x + 6) equal to 6.08276253 and -6.08276253.

Subproblem 1
x + 6 = 6.08276253

Simplifying
x + 6 = 6.08276253

Reorder the terms:
6 + x = 6.08276253

Solving
6 + x = 6.08276253

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-6' to each side of the equation.
6 + -6 + x = 6.08276253 + -6

Combine like terms: 6 + -6 = 0
0 + x = 6.08276253 + -6
x = 6.08276253 + -6

Combine like terms: 6.08276253 + -6 = 0.08276253
x = 0.08276253

Simplifying
x = 0.08276253

Subproblem 2
x + 6 = -6.08276253

Simplifying
x + 6 = -6.08276253

Reorder the terms:
6 + x = -6.08276253

Solving
6 + x = -6.08276253

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-6' to each side of the equation.
6 + -6 + x = -6.08276253 + -6

Combine like terms: 6 + -6 = 0
0 + x = -6.08276253 + -6
x = -6.08276253 + -6

Combine like terms: -6.08276253 + -6 = -12.08276253
x = -12.08276253

Simplifying
x = -12.08276253

Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {0.08276253, -12.08276253}