104=2(x+3)(x-1)

Solution for 104=2(x+3)(x-1) equation:

Simplifying
104 = 2(x + 3)(x + -1)

Reorder the terms:
104 = 2(3 + x)(x + -1)

Reorder the terms:
104 = 2(3 + x)(-1 + x)

Multiply (3 + x) * (-1 + x)
104 = 2(3(-1 + x) + x(-1 + x))
104 = 2((-1 * 3 + x * 3) + x(-1 + x))
104 = 2((-3 + 3x) + x(-1 + x))
104 = 2(-3 + 3x + (-1 * x + x * x))
104 = 2(-3 + 3x + (-1x + x2))

Combine like terms: 3x + -1x = 2x
104 = 2(-3 + 2x + x2)
104 = (-3 * 2 + 2x * 2 + x2 * 2)
104 = (-6 + 4x + 2x2)

Solving
104 = -6 + 4x + 2x2

Solving for variable 'x'.

Combine like terms: 104 + 6 = 110
110 + -4x + -2x2 = -6 + 4x + 2x2 + 6 + -4x + -2x2

Reorder the terms:
110 + -4x + -2x2 = -6 + 6 + 4x + -4x + 2x2 + -2x2

Combine like terms: -6 + 6 = 0
110 + -4x + -2x2 = 0 + 4x + -4x + 2x2 + -2x2
110 + -4x + -2x2 = 4x + -4x + 2x2 + -2x2

Combine like terms: 4x + -4x = 0
110 + -4x + -2x2 = 0 + 2x2 + -2x2
110 + -4x + -2x2 = 2x2 + -2x2

Combine like terms: 2x2 + -2x2 = 0
110 + -4x + -2x2 = 0

Factor out the Greatest Common Factor (GCF), '2'.
2(55 + -2x + -1x2) = 0

Ignore the factor 2.
Subproblem 1
Set the factor '(55 + -2x + -1x2)' equal to zero and attempt to solve:

Simplifying
55 + -2x + -1x2 = 0

Solving
55 + -2x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-55 + 2x + x2 = 0

Move the constant term to the right:

Add '55' to each side of the equation.
-55 + 2x + 55 + x2 = 0 + 55

Reorder the terms:
-55 + 55 + 2x + x2 = 0 + 55

Combine like terms: -55 + 55 = 0
0 + 2x + x2 = 0 + 55
2x + x2 = 0 + 55

Combine like terms: 0 + 55 = 55
2x + x2 = 55

The x term is 2x.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2x + 1 + x2 = 55 + 1

Reorder the terms:
1 + 2x + x2 = 55 + 1

Combine like terms: 55 + 1 = 56
1 + 2x + x2 = 56

Factor a perfect square on the left side:
(x + 1)(x + 1) = 56

Calculate the square root of the right side: 7.483314774

Break this problem into two subproblems by setting 
(x + 1) equal to 7.483314774 and -7.483314774.

Subproblem 1
x + 1 = 7.483314774

Simplifying
x + 1 = 7.483314774

Reorder the terms:
1 + x = 7.483314774

Solving
1 + x = 7.483314774

Solving for variable 'x'.

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

Add '-1' to each side of the equation.
1 + -1 + x = 7.483314774 + -1

Combine like terms: 1 + -1 = 0
0 + x = 7.483314774 + -1
x = 7.483314774 + -1

Combine like terms: 7.483314774 + -1 = 6.483314774
x = 6.483314774

Simplifying
x = 6.483314774

Subproblem 2
x + 1 = -7.483314774

Simplifying
x + 1 = -7.483314774

Reorder the terms:
1 + x = -7.483314774

Solving
1 + x = -7.483314774

Solving for variable 'x'.

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

Add '-1' to each side of the equation.
1 + -1 + x = -7.483314774 + -1

Combine like terms: 1 + -1 = 0
0 + x = -7.483314774 + -1
x = -7.483314774 + -1

Combine like terms: -7.483314774 + -1 = -8.483314774
x = -8.483314774

Simplifying
x = -8.483314774

Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {6.483314774, -8.483314774}
Solution
x = {6.483314774, -8.483314774}