4x^2-12x-18=0

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Solution for 4x^2-12x-18=0 equation: 


Simplifying
4x2 + -12x + -18 = 0

Reorder the terms:
-18 + -12x + 4x2 = 0

Solving
-18 + -12x + 4x2 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), '2'.
2(-9 + -6x + 2x2) = 0

Ignore the factor 2.

Subproblem 1
Set the factor '(-9 + -6x + 2x2)' equal to zero and attempt to solve:

Simplifying
-9 + -6x + 2x2 = 0

Solving
-9 + -6x + 2x2 = 0

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

Divide each side by '2'.
-4.5 + -3x + x2 = 0

Move the constant term to the right:

Add '4.5' to each side of the equation.
-4.5 + -3x + 4.5 + x2 = 0 + 4.5

Reorder the terms:
-4.5 + 4.5 + -3x + x2 = 0 + 4.5

Combine like terms: -4.5 + 4.5 = 0.0
0.0 + -3x + x2 = 0 + 4.5
-3x + x2 = 0 + 4.5

Combine like terms: 0 + 4.5 = 4.5
-3x + x2 = 4.5

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 = 4.5 + 2.25

Reorder the terms:
2.25 + -3x + x2 = 4.5 + 2.25

Combine like terms: 4.5 + 2.25 = 6.75
2.25 + -3x + x2 = 6.75

Factor a perfect square on the left side:
(x + -1.5)(x + -1.5) = 6.75

Calculate the square root of the right side: 2.598076211

Break this problem into two subproblems by setting 
(x + -1.5) equal to 2.598076211 and -2.598076211.


Subproblem 1
x + -1.5 = 2.598076211

Simplifying
x + -1.5 = 2.598076211

Reorder the terms:
-1.5 + x = 2.598076211

Solving
-1.5 + x = 2.598076211

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 = 2.598076211 + 1.5

Combine like terms: -1.5 + 1.5 = 0.0
0.0 + x = 2.598076211 + 1.5
x = 2.598076211 + 1.5

Combine like terms: 2.598076211 + 1.5 = 4.098076211
x = 4.098076211

Simplifying
x = 4.098076211


Subproblem 2
x + -1.5 = -2.598076211

Simplifying
x + -1.5 = -2.598076211

Reorder the terms:
-1.5 + x = -2.598076211

Solving
-1.5 + x = -2.598076211

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 = -2.598076211 + 1.5

Combine like terms: -1.5 + 1.5 = 0.0
0.0 + x = -2.598076211 + 1.5
x = -2.598076211 + 1.5

Combine like terms: -2.598076211 + 1.5 = -1.098076211
x = -1.098076211

Simplifying
x = -1.098076211


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {4.098076211, -1.098076211}
Solution
x = {4.098076211, -1.098076211}

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