x^2+12x=-2

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


Simplifying
x2 + 12x = -2

Reorder the terms:
12x + x2 = -2

Solving
12x + x2 = -2

Solving for variable 'x'.

Reorder the terms:
2 + 12x + x2 = -2 + 2

Combine like terms: -2 + 2 = 0
2 + 12x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-2' to each side of the equation.
2 + 12x + -2 + x2 = 0 + -2

Reorder the terms:
2 + -2 + 12x + x2 = 0 + -2

Combine like terms: 2 + -2 = 0
0 + 12x + x2 = 0 + -2
12x + x2 = 0 + -2

Combine like terms: 0 + -2 = -2
12x + x2 = -2

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 = -2 + 36

Reorder the terms:
36 + 12x + x2 = -2 + 36

Combine like terms: -2 + 36 = 34
36 + 12x + x2 = 34

Factor a perfect square on the left side:
(x + 6)(x + 6) = 34

Calculate the square root of the right side: 5.830951895

Break this problem into two subproblems by setting 
(x + 6) equal to 5.830951895 and -5.830951895.

Subproblem 1

x + 6 = 5.830951895 Simplifying x + 6 = 5.830951895 Reorder the terms: 6 + x = 5.830951895 Solving 6 + x = 5.830951895 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 = 5.830951895 + -6 Combine like terms: 6 + -6 = 0 0 + x = 5.830951895 + -6 x = 5.830951895 + -6 Combine like terms: 5.830951895 + -6 = -0.169048105 x = -0.169048105 Simplifying x = -0.169048105

Subproblem 2

x + 6 = -5.830951895 Simplifying x + 6 = -5.830951895 Reorder the terms: 6 + x = -5.830951895 Solving 6 + x = -5.830951895 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 = -5.830951895 + -6 Combine like terms: 6 + -6 = 0 0 + x = -5.830951895 + -6 x = -5.830951895 + -6 Combine like terms: -5.830951895 + -6 = -11.830951895 x = -11.830951895 Simplifying x = -11.830951895

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.169048105, -11.830951895}

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