3(x+6)(x+6)=33

Solution for 3(x+6)(x+6)=33 equation:

Simplifying
3(x + 6)(x + 6) = 33

Reorder the terms:
3(6 + x)(x + 6) = 33

Reorder the terms:
3(6 + x)(6 + x) = 33

Multiply (6 + x) * (6 + x)
3(6(6 + x) + x(6 + x)) = 33
3((6 * 6 + x * 6) + x(6 + x)) = 33
3((36 + 6x) + x(6 + x)) = 33
3(36 + 6x + (6 * x + x * x)) = 33
3(36 + 6x + (6x + x2)) = 33

Combine like terms: 6x + 6x = 12x
3(36 + 12x + x2) = 33
(36 * 3 + 12x * 3 + x2 * 3) = 33
(108 + 36x + 3x2) = 33

Solving
108 + 36x + 3x2 = 33

Solving for variable 'x'.

Reorder the terms:
108 + -33 + 36x + 3x2 = 33 + -33

Combine like terms: 108 + -33 = 75
75 + 36x + 3x2 = 33 + -33

Combine like terms: 33 + -33 = 0
75 + 36x + 3x2 = 0

Factor out the Greatest Common Factor (GCF), '3'.
3(25 + 12x + x2) = 0

Ignore the factor 3.
Subproblem 1
Set the factor '(25 + 12x + x2)' equal to zero and attempt to solve:

Simplifying
25 + 12x + x2 = 0

Solving
25 + 12x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-25' to each side of the equation.
25 + 12x + -25 + x2 = 0 + -25

Reorder the terms:
25 + -25 + 12x + x2 = 0 + -25

Combine like terms: 25 + -25 = 0
0 + 12x + x2 = 0 + -25
12x + x2 = 0 + -25

Combine like terms: 0 + -25 = -25
12x + x2 = -25

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 = -25 + 36

Reorder the terms:
36 + 12x + x2 = -25 + 36

Combine like terms: -25 + 36 = 11
36 + 12x + x2 = 11

Factor a perfect square on the left side:
(x + 6)(x + 6) = 11

Calculate the square root of the right side: 3.31662479

Break this problem into two subproblems by setting 
(x + 6) equal to 3.31662479 and -3.31662479.

Subproblem 1
x + 6 = 3.31662479

Simplifying
x + 6 = 3.31662479

Reorder the terms:
6 + x = 3.31662479

Solving
6 + x = 3.31662479

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 = 3.31662479 + -6

Combine like terms: 6 + -6 = 0
0 + x = 3.31662479 + -6
x = 3.31662479 + -6

Combine like terms: 3.31662479 + -6 = -2.68337521
x = -2.68337521

Simplifying
x = -2.68337521

Subproblem 2
x + 6 = -3.31662479

Simplifying
x + 6 = -3.31662479

Reorder the terms:
6 + x = -3.31662479

Solving
6 + x = -3.31662479

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 = -3.31662479 + -6

Combine like terms: 6 + -6 = 0
0 + x = -3.31662479 + -6
x = -3.31662479 + -6

Combine like terms: -3.31662479 + -6 = -9.31662479
x = -9.31662479

Simplifying
x = -9.31662479

Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {-2.68337521, -9.31662479}
Solution
x = {-2.68337521, -9.31662479}