6x^2-18x-18=0

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


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

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

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

Solving for variable 'x'.

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

Ignore the factor 6.

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

Simplifying
-3 + -3x + x2 = 0

Solving
-3 + -3x + x2 = 0

Begin completing the square.

Move the constant term to the right:

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

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

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

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

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 = 3 + 2.25

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

Combine like terms: 3 + 2.25 = 5.25
2.25 + -3x + x2 = 5.25

Factor a perfect square on the left side:
(x + -1.5)(x + -1.5) = 5.25

Calculate the square root of the right side: 2.291287847

Break this problem into two subproblems by setting 
(x + -1.5) equal to 2.291287847 and -2.291287847.


Subproblem 1
x + -1.5 = 2.291287847

Simplifying
x + -1.5 = 2.291287847

Reorder the terms:
-1.5 + x = 2.291287847

Solving
-1.5 + x = 2.291287847

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 = 2.291287847 + 1.5

Combine like terms: -1.5 + 1.5 = 0.0
0.0 + x = 2.291287847 + 1.5
x = 2.291287847 + 1.5

Combine like terms: 2.291287847 + 1.5 = 3.791287847
x = 3.791287847

Simplifying
x = 3.791287847


Subproblem 2
x + -1.5 = -2.291287847

Simplifying
x + -1.5 = -2.291287847

Reorder the terms:
-1.5 + x = -2.291287847

Solving
-1.5 + x = -2.291287847

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 = -2.291287847 + 1.5

Combine like terms: -1.5 + 1.5 = 0.0
0.0 + x = -2.291287847 + 1.5
x = -2.291287847 + 1.5

Combine like terms: -2.291287847 + 1.5 = -0.791287847
x = -0.791287847

Simplifying
x = -0.791287847


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {3.791287847, -0.791287847}
Solution
x = {3.791287847, -0.791287847}

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