6x^2+72x+12=0

Solution for 6x^2+72x+12=0 equation:

Simplifying
6x2 + 72x + 12 = 0

Reorder the terms:
12 + 72x + 6x2 = 0

Solving
12 + 72x + 6x2 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), '6'.
6(2 + 12x + x2) = 0

Ignore the factor 6.
Subproblem 1
Set the factor '(2 + 12x + x2)' equal to zero and attempt to solve:

Simplifying
2 + 12x + x2 = 0

Solving
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}
Solution
x = {-0.169048105, -11.830951895}