4x^2+12x+9=11

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Solution for 4x^2+12x+9=11 equation: 


Simplifying
4x2 + 12x + 9 = 11

Reorder the terms:
9 + 12x + 4x2 = 11

Solving
9 + 12x + 4x2 = 11

Solving for variable 'x'.

Reorder the terms:
9 + -11 + 12x + 4x2 = 11 + -11

Combine like terms: 9 + -11 = -2
-2 + 12x + 4x2 = 11 + -11

Combine like terms: 11 + -11 = 0
-2 + 12x + 4x2 = 0

Factor out the Greatest Common Factor (GCF), '2'.
2(-1 + 6x + 2x2) = 0

Ignore the factor 2.

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

Simplifying
-1 + 6x + 2x2 = 0

Solving
-1 + 6x + 2x2 = 0

Begin completing the square.  Divide all terms by
2 the coefficient of the squared term: 

Divide each side by '2'.
-0.5 + 3x + x2 = 0

Move the constant term to the right:

Add '0.5' to each side of the equation.
-0.5 + 3x + 0.5 + x2 = 0 + 0.5

Reorder the terms:
-0.5 + 0.5 + 3x + x2 = 0 + 0.5

Combine like terms: -0.5 + 0.5 = 0.0
0.0 + 3x + x2 = 0 + 0.5
3x + x2 = 0 + 0.5

Combine like terms: 0 + 0.5 = 0.5
3x + x2 = 0.5

The x term is 3x.  Take half its coefficient (1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
3x + 2.25 + x2 = 0.5 + 2.25

Reorder the terms:
2.25 + 3x + x2 = 0.5 + 2.25

Combine like terms: 0.5 + 2.25 = 2.75
2.25 + 3x + x2 = 2.75

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = 2.75

Calculate the square root of the right side: 1.658312395

Break this problem into two subproblems by setting 
(x + 1.5) equal to 1.658312395 and -1.658312395.


Subproblem 1
x + 1.5 = 1.658312395

Simplifying
x + 1.5 = 1.658312395

Reorder the terms:
1.5 + x = 1.658312395

Solving
1.5 + x = 1.658312395

Solving for variable 'x'.

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

Add '-1.5' to each side of the equation.
1.5 + -1.5 + x = 1.658312395 + -1.5

Combine like terms: 1.5 + -1.5 = 0.0
0.0 + x = 1.658312395 + -1.5
x = 1.658312395 + -1.5

Combine like terms: 1.658312395 + -1.5 = 0.158312395
x = 0.158312395

Simplifying
x = 0.158312395


Subproblem 2
x + 1.5 = -1.658312395

Simplifying
x + 1.5 = -1.658312395

Reorder the terms:
1.5 + x = -1.658312395

Solving
1.5 + x = -1.658312395

Solving for variable 'x'.

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

Add '-1.5' to each side of the equation.
1.5 + -1.5 + x = -1.658312395 + -1.5

Combine like terms: 1.5 + -1.5 = 0.0
0.0 + x = -1.658312395 + -1.5
x = -1.658312395 + -1.5

Combine like terms: -1.658312395 + -1.5 = -3.158312395
x = -3.158312395

Simplifying
x = -3.158312395


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {0.158312395, -3.158312395}
Solution
x = {0.158312395, -3.158312395}

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