3x^2+18x+6=0

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Solution for 3x^2+18x+6=0 equation: 


Simplifying
3x2 + 18x + 6 = 0

Reorder the terms:
6 + 18x + 3x2 = 0

Solving
6 + 18x + 3x2 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), '3'.
3(2 + 6x + x2) = 0

Ignore the factor 3.

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

Simplifying
2 + 6x + x2 = 0

Solving
2 + 6x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-2' to each side of the equation.
2 + 6x + -2 + x2 = 0 + -2

Reorder the terms:
2 + -2 + 6x + x2 = 0 + -2

Combine like terms: 2 + -2 = 0
0 + 6x + x2 = 0 + -2
6x + x2 = 0 + -2

Combine like terms: 0 + -2 = -2
6x + x2 = -2

The x term is 6x.  Take half its coefficient (3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
6x + 9 + x2 = -2 + 9

Reorder the terms:
9 + 6x + x2 = -2 + 9

Combine like terms: -2 + 9 = 7
9 + 6x + x2 = 7

Factor a perfect square on the left side:
(x + 3)(x + 3) = 7

Calculate the square root of the right side: 2.645751311

Break this problem into two subproblems by setting 
(x + 3) equal to 2.645751311 and -2.645751311.


Subproblem 1
x + 3 = 2.645751311

Simplifying
x + 3 = 2.645751311

Reorder the terms:
3 + x = 2.645751311

Solving
3 + x = 2.645751311

Solving for variable 'x'.

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

Add '-3' to each side of the equation.
3 + -3 + x = 2.645751311 + -3

Combine like terms: 3 + -3 = 0
0 + x = 2.645751311 + -3
x = 2.645751311 + -3

Combine like terms: 2.645751311 + -3 = -0.354248689
x = -0.354248689

Simplifying
x = -0.354248689


Subproblem 2
x + 3 = -2.645751311

Simplifying
x + 3 = -2.645751311

Reorder the terms:
3 + x = -2.645751311

Solving
3 + x = -2.645751311

Solving for variable 'x'.

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

Add '-3' to each side of the equation.
3 + -3 + x = -2.645751311 + -3

Combine like terms: 3 + -3 = 0
0 + x = -2.645751311 + -3
x = -2.645751311 + -3

Combine like terms: -2.645751311 + -3 = -5.645751311
x = -5.645751311

Simplifying
x = -5.645751311


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {-0.354248689, -5.645751311}
Solution
x = {-0.354248689, -5.645751311}

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