6x^2-18x-66=0

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Solution for 6x^2-18x-66=0 equation: 


Simplifying
6x2 + -18x + -66 = 0

Reorder the terms:
-66 + -18x + 6x2 = 0

Solving
-66 + -18x + 6x2 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), '6'.
6(-11 + -3x + x2) = 0

Ignore the factor 6.

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

Simplifying
-11 + -3x + x2 = 0

Solving
-11 + -3x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '11' to each side of the equation.
-11 + -3x + 11 + x2 = 0 + 11

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

Combine like terms: -11 + 11 = 0
0 + -3x + x2 = 0 + 11
-3x + x2 = 0 + 11

Combine like terms: 0 + 11 = 11
-3x + x2 = 11

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 = 11 + 2.25

Reorder the terms:
2.25 + -3x + x2 = 11 + 2.25

Combine like terms: 11 + 2.25 = 13.25
2.25 + -3x + x2 = 13.25

Factor a perfect square on the left side:
(x + -1.5)(x + -1.5) = 13.25

Calculate the square root of the right side: 3.640054945

Break this problem into two subproblems by setting 
(x + -1.5) equal to 3.640054945 and -3.640054945.


Subproblem 1
x + -1.5 = 3.640054945

Simplifying
x + -1.5 = 3.640054945

Reorder the terms:
-1.5 + x = 3.640054945

Solving
-1.5 + x = 3.640054945

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 = 3.640054945 + 1.5

Combine like terms: -1.5 + 1.5 = 0.0
0.0 + x = 3.640054945 + 1.5
x = 3.640054945 + 1.5

Combine like terms: 3.640054945 + 1.5 = 5.140054945
x = 5.140054945

Simplifying
x = 5.140054945


Subproblem 2
x + -1.5 = -3.640054945

Simplifying
x + -1.5 = -3.640054945

Reorder the terms:
-1.5 + x = -3.640054945

Solving
-1.5 + x = -3.640054945

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 = -3.640054945 + 1.5

Combine like terms: -1.5 + 1.5 = 0.0
0.0 + x = -3.640054945 + 1.5
x = -3.640054945 + 1.5

Combine like terms: -3.640054945 + 1.5 = -2.140054945
x = -2.140054945

Simplifying
x = -2.140054945


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {5.140054945, -2.140054945}
Solution
x = {5.140054945, -2.140054945}

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