x(x^2-4x-18)=0

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


Simplifying
x(x2 + -4x + -18) = 0

Reorder the terms:
x(-18 + -4x + x2) = 0
(-18 * x + -4x * x + x2 * x) = 0
(-18x + -4x2 + x3) = 0

Solving
-18x + -4x2 + x3 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), 'x'.
x(-18 + -4x + x2) = 0


Subproblem 1
Set the factor 'x' equal to zero and attempt to solve:

Simplifying
x = 0

Solving
x = 0

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

Simplifying
x = 0

Subproblem 2
Set the factor '(-18 + -4x + x2)' equal to zero and attempt to solve:

Simplifying
-18 + -4x + x2 = 0

Solving
-18 + -4x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '18' to each side of the equation.
-18 + -4x + 18 + x2 = 0 + 18

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

Combine like terms: -18 + 18 = 0
0 + -4x + x2 = 0 + 18
-4x + x2 = 0 + 18

Combine like terms: 0 + 18 = 18
-4x + x2 = 18

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 = 18 + 4

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

Combine like terms: 18 + 4 = 22
4 + -4x + x2 = 22

Factor a perfect square on the left side:
(x + -2)(x + -2) = 22

Calculate the square root of the right side: 4.69041576

Break this problem into two subproblems by setting 
(x + -2) equal to 4.69041576 and -4.69041576.


Subproblem 1
x + -2 = 4.69041576

Simplifying
x + -2 = 4.69041576

Reorder the terms:
-2 + x = 4.69041576

Solving
-2 + x = 4.69041576

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 = 4.69041576 + 2

Combine like terms: -2 + 2 = 0
0 + x = 4.69041576 + 2
x = 4.69041576 + 2

Combine like terms: 4.69041576 + 2 = 6.69041576
x = 6.69041576

Simplifying
x = 6.69041576


Subproblem 2
x + -2 = -4.69041576

Simplifying
x + -2 = -4.69041576

Reorder the terms:
-2 + x = -4.69041576

Solving
-2 + x = -4.69041576

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 = -4.69041576 + 2

Combine like terms: -2 + 2 = 0
0 + x = -4.69041576 + 2
x = -4.69041576 + 2

Combine like terms: -4.69041576 + 2 = -2.69041576
x = -2.69041576

Simplifying
x = -2.69041576


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {6.69041576, -2.69041576}
Solution
x = {0, 6.69041576, -2.69041576}

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