-3x^2-12x-11=0

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Solution for -3x^2-12x-11=0 equation: 


Simplifying
-3x2 + -12x + -11 = 0

Reorder the terms:
-11 + -12x + -3x2 = 0

Solving
-11 + -12x + -3x2 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), '-1'.
-1(11 + 12x + 3x2) = 0

Ignore the factor -1.

Subproblem 1
Set the factor '(11 + 12x + 3x2)' equal to zero and attempt to solve:

Simplifying
11 + 12x + 3x2 = 0

Solving
11 + 12x + 3x2 = 0

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

Divide each side by '3'.
3.666666667 + 4x + x2 = 0

Move the constant term to the right:

Add '-3.666666667' to each side of the equation.
3.666666667 + 4x + -3.666666667 + x2 = 0 + -3.666666667

Reorder the terms:
3.666666667 + -3.666666667 + 4x + x2 = 0 + -3.666666667

Combine like terms: 3.666666667 + -3.666666667 = 0.000000000
0.000000000 + 4x + x2 = 0 + -3.666666667
4x + x2 = 0 + -3.666666667

Combine like terms: 0 + -3.666666667 = -3.666666667
4x + x2 = -3.666666667

The x term is 4x.  Take half its coefficient (2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
4x + 4 + x2 = -3.666666667 + 4

Reorder the terms:
4 + 4x + x2 = -3.666666667 + 4

Combine like terms: -3.666666667 + 4 = 0.333333333
4 + 4x + x2 = 0.333333333

Factor a perfect square on the left side:
(x + 2)(x + 2) = 0.333333333

Calculate the square root of the right side: 0.577350269

Break this problem into two subproblems by setting 
(x + 2) equal to 0.577350269 and -0.577350269.


Subproblem 1
x + 2 = 0.577350269

Simplifying
x + 2 = 0.577350269

Reorder the terms:
2 + x = 0.577350269

Solving
2 + x = 0.577350269

Solving for variable 'x'.

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

Add '-2' to each side of the equation.
2 + -2 + x = 0.577350269 + -2

Combine like terms: 2 + -2 = 0
0 + x = 0.577350269 + -2
x = 0.577350269 + -2

Combine like terms: 0.577350269 + -2 = -1.422649731
x = -1.422649731

Simplifying
x = -1.422649731


Subproblem 2
x + 2 = -0.577350269

Simplifying
x + 2 = -0.577350269

Reorder the terms:
2 + x = -0.577350269

Solving
2 + x = -0.577350269

Solving for variable 'x'.

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

Add '-2' to each side of the equation.
2 + -2 + x = -0.577350269 + -2

Combine like terms: 2 + -2 = 0
0 + x = -0.577350269 + -2
x = -0.577350269 + -2

Combine like terms: -0.577350269 + -2 = -2.577350269
x = -2.577350269

Simplifying
x = -2.577350269


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {-1.422649731, -2.577350269}
Solution
x = {-1.422649731, -2.577350269}

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