(2x+6)(x-4)=8

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Solution for (2x+6)(x-4)=8 equation: 


Simplifying
(2x + 6)(x + -4) = 8

Reorder the terms:
(6 + 2x)(x + -4) = 8

Reorder the terms:
(6 + 2x)(-4 + x) = 8

Multiply (6 + 2x) * (-4 + x)
(6(-4 + x) + 2x * (-4 + x)) = 8
((-4 * 6 + x * 6) + 2x * (-4 + x)) = 8
((-24 + 6x) + 2x * (-4 + x)) = 8
(-24 + 6x + (-4 * 2x + x * 2x)) = 8
(-24 + 6x + (-8x + 2x2)) = 8

Combine like terms: 6x + -8x = -2x
(-24 + -2x + 2x2) = 8

Solving
-24 + -2x + 2x2 = 8

Solving for variable 'x'.

Reorder the terms:
-24 + -8 + -2x + 2x2 = 8 + -8

Combine like terms: -24 + -8 = -32
-32 + -2x + 2x2 = 8 + -8

Combine like terms: 8 + -8 = 0
-32 + -2x + 2x2 = 0

Factor out the Greatest Common Factor (GCF), '2'.
2(-16 + -1x + x2) = 0

Ignore the factor 2.

Subproblem 1
Set the factor '(-16 + -1x + x2)' equal to zero and attempt to solve:

Simplifying
-16 + -1x + x2 = 0

Solving
-16 + -1x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '16' to each side of the equation.
-16 + -1x + 16 + x2 = 0 + 16

Reorder the terms:
-16 + 16 + -1x + x2 = 0 + 16

Combine like terms: -16 + 16 = 0
0 + -1x + x2 = 0 + 16
-1x + x2 = 0 + 16

Combine like terms: 0 + 16 = 16
-1x + x2 = 16

The x term is -1x.  Take half its coefficient (-0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
-1x + 0.25 + x2 = 16 + 0.25

Reorder the terms:
0.25 + -1x + x2 = 16 + 0.25

Combine like terms: 16 + 0.25 = 16.25
0.25 + -1x + x2 = 16.25

Factor a perfect square on the left side:
(x + -0.5)(x + -0.5) = 16.25

Calculate the square root of the right side: 4.031128874

Break this problem into two subproblems by setting 
(x + -0.5) equal to 4.031128874 and -4.031128874.


Subproblem 1
x + -0.5 = 4.031128874

Simplifying
x + -0.5 = 4.031128874

Reorder the terms:
-0.5 + x = 4.031128874

Solving
-0.5 + x = 4.031128874

Solving for variable 'x'.

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

Add '0.5' to each side of the equation.
-0.5 + 0.5 + x = 4.031128874 + 0.5

Combine like terms: -0.5 + 0.5 = 0.0
0.0 + x = 4.031128874 + 0.5
x = 4.031128874 + 0.5

Combine like terms: 4.031128874 + 0.5 = 4.531128874
x = 4.531128874

Simplifying
x = 4.531128874


Subproblem 2
x + -0.5 = -4.031128874

Simplifying
x + -0.5 = -4.031128874

Reorder the terms:
-0.5 + x = -4.031128874

Solving
-0.5 + x = -4.031128874

Solving for variable 'x'.

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

Add '0.5' to each side of the equation.
-0.5 + 0.5 + x = -4.031128874 + 0.5

Combine like terms: -0.5 + 0.5 = 0.0
0.0 + x = -4.031128874 + 0.5
x = -4.031128874 + 0.5

Combine like terms: -4.031128874 + 0.5 = -3.531128874
x = -3.531128874

Simplifying
x = -3.531128874


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {4.531128874, -3.531128874}
Solution
x = {4.531128874, -3.531128874}

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