x^2+12x+3=-x

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Solution for x^2+12x+3=-x equation:


Simplifying
x2 + 12x + 3 = -1x

Reorder the terms:
3 + 12x + x2 = -1x

Solving
3 + 12x + x2 = -1x

Solving for variable 'x'.

Reorder the terms:
3 + 12x + x + x2 = -1x + x

Combine like terms: 12x + x = 13x
3 + 13x + x2 = -1x + x

Combine like terms: -1x + x = 0
3 + 13x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-3' to each side of the equation.
3 + 13x + -3 + x2 = 0 + -3

Reorder the terms:
3 + -3 + 13x + x2 = 0 + -3

Combine like terms: 3 + -3 = 0
0 + 13x + x2 = 0 + -3
13x + x2 = 0 + -3

Combine like terms: 0 + -3 = -3
13x + x2 = -3

The x term is 13x.  Take half its coefficient (6.5).
Square it (42.25) and add it to both sides.

Add '42.25' to each side of the equation.
13x + 42.25 + x2 = -3 + 42.25

Reorder the terms:
42.25 + 13x + x2 = -3 + 42.25

Combine like terms: -3 + 42.25 = 39.25
42.25 + 13x + x2 = 39.25

Factor a perfect square on the left side:
(x + 6.5)(x + 6.5) = 39.25

Calculate the square root of the right side: 6.264982043

Break this problem into two subproblems by setting 
(x + 6.5) equal to 6.264982043 and -6.264982043.

Subproblem 1

x + 6.5 = 6.264982043 Simplifying x + 6.5 = 6.264982043 Reorder the terms: 6.5 + x = 6.264982043 Solving 6.5 + x = 6.264982043 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6.5' to each side of the equation. 6.5 + -6.5 + x = 6.264982043 + -6.5 Combine like terms: 6.5 + -6.5 = 0.0 0.0 + x = 6.264982043 + -6.5 x = 6.264982043 + -6.5 Combine like terms: 6.264982043 + -6.5 = -0.235017957 x = -0.235017957 Simplifying x = -0.235017957

Subproblem 2

x + 6.5 = -6.264982043 Simplifying x + 6.5 = -6.264982043 Reorder the terms: 6.5 + x = -6.264982043 Solving 6.5 + x = -6.264982043 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6.5' to each side of the equation. 6.5 + -6.5 + x = -6.264982043 + -6.5 Combine like terms: 6.5 + -6.5 = 0.0 0.0 + x = -6.264982043 + -6.5 x = -6.264982043 + -6.5 Combine like terms: -6.264982043 + -6.5 = -12.764982043 x = -12.764982043 Simplifying x = -12.764982043

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.235017957, -12.764982043}

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