(x+9)x(-2)=8

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Solution for (x+9)x(-2)=8 equation: 


Simplifying
(x + 9) * x(-2) = 8

Reorder the terms:
(9 + x) * x(-2) = 8

Reorder the terms for easier multiplication:
-2x(9 + x) = 8
(9 * -2x + x * -2x) = 8
(-18x + -2x2) = 8

Solving
-18x + -2x2 = 8

Solving for variable 'x'.

Reorder the terms:
-8 + -18x + -2x2 = 8 + -8

Combine like terms: 8 + -8 = 0
-8 + -18x + -2x2 = 0

Factor out the Greatest Common Factor (GCF), '-2'.
-2(4 + 9x + x2) = 0

Ignore the factor -2.

Subproblem 1
Set the factor '(4 + 9x + x2)' equal to zero and attempt to solve:

Simplifying
4 + 9x + x2 = 0

Solving
4 + 9x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-4' to each side of the equation.
4 + 9x + -4 + x2 = 0 + -4

Reorder the terms:
4 + -4 + 9x + x2 = 0 + -4

Combine like terms: 4 + -4 = 0
0 + 9x + x2 = 0 + -4
9x + x2 = 0 + -4

Combine like terms: 0 + -4 = -4
9x + x2 = -4

The x term is 9x.  Take half its coefficient (4.5).
Square it (20.25) and add it to both sides.

Add '20.25' to each side of the equation.
9x + 20.25 + x2 = -4 + 20.25

Reorder the terms:
20.25 + 9x + x2 = -4 + 20.25

Combine like terms: -4 + 20.25 = 16.25
20.25 + 9x + x2 = 16.25

Factor a perfect square on the left side:
(x + 4.5)(x + 4.5) = 16.25

Calculate the square root of the right side: 4.031128874

Break this problem into two subproblems by setting 
(x + 4.5) equal to 4.031128874 and -4.031128874.


Subproblem 1
x + 4.5 = 4.031128874

Simplifying
x + 4.5 = 4.031128874

Reorder the terms:
4.5 + x = 4.031128874

Solving
4.5 + x = 4.031128874

Solving for variable 'x'.

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

Add '-4.5' to each side of the equation.
4.5 + -4.5 + x = 4.031128874 + -4.5

Combine like terms: 4.5 + -4.5 = 0.0
0.0 + x = 4.031128874 + -4.5
x = 4.031128874 + -4.5

Combine like terms: 4.031128874 + -4.5 = -0.468871126
x = -0.468871126

Simplifying
x = -0.468871126


Subproblem 2
x + 4.5 = -4.031128874

Simplifying
x + 4.5 = -4.031128874

Reorder the terms:
4.5 + x = -4.031128874

Solving
4.5 + x = -4.031128874

Solving for variable 'x'.

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

Add '-4.5' to each side of the equation.
4.5 + -4.5 + x = -4.031128874 + -4.5

Combine like terms: 4.5 + -4.5 = 0.0
0.0 + x = -4.031128874 + -4.5
x = -4.031128874 + -4.5

Combine like terms: -4.031128874 + -4.5 = -8.531128874
x = -8.531128874

Simplifying
x = -8.531128874


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {-0.468871126, -8.531128874}
Solution
x = {-0.468871126, -8.531128874}

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