2x-6-2x+12=(x+3)(x-8)

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Solution for 2x-6-2x+12=(x+3)(x-8) equation:


Simplifying
2x + -6 + -2x + 12 = (x + 3)(x + -8)

Reorder the terms:
-6 + 12 + 2x + -2x = (x + 3)(x + -8)

Combine like terms: -6 + 12 = 6
6 + 2x + -2x = (x + 3)(x + -8)

Combine like terms: 2x + -2x = 0
6 + 0 = (x + 3)(x + -8)
6 = (x + 3)(x + -8)

Reorder the terms:
6 = (3 + x)(x + -8)

Reorder the terms:
6 = (3 + x)(-8 + x)

Multiply (3 + x) * (-8 + x)
6 = (3(-8 + x) + x(-8 + x))
6 = ((-8 * 3 + x * 3) + x(-8 + x))
6 = ((-24 + 3x) + x(-8 + x))
6 = (-24 + 3x + (-8 * x + x * x))
6 = (-24 + 3x + (-8x + x2))

Combine like terms: 3x + -8x = -5x
6 = (-24 + -5x + x2)

Solving
6 = -24 + -5x + x2

Solving for variable 'x'.

Combine like terms: 6 + 24 = 30
30 + 5x + -1x2 = -24 + -5x + x2 + 24 + 5x + -1x2

Reorder the terms:
30 + 5x + -1x2 = -24 + 24 + -5x + 5x + x2 + -1x2

Combine like terms: -24 + 24 = 0
30 + 5x + -1x2 = 0 + -5x + 5x + x2 + -1x2
30 + 5x + -1x2 = -5x + 5x + x2 + -1x2

Combine like terms: -5x + 5x = 0
30 + 5x + -1x2 = 0 + x2 + -1x2
30 + 5x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
30 + 5x + -1x2 = 0

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

Divide each side by '-1'.
-30 + -5x + x2 = 0

Move the constant term to the right:

Add '30' to each side of the equation.
-30 + -5x + 30 + x2 = 0 + 30

Reorder the terms:
-30 + 30 + -5x + x2 = 0 + 30

Combine like terms: -30 + 30 = 0
0 + -5x + x2 = 0 + 30
-5x + x2 = 0 + 30

Combine like terms: 0 + 30 = 30
-5x + x2 = 30

The x term is -5x.  Take half its coefficient (-2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
-5x + 6.25 + x2 = 30 + 6.25

Reorder the terms:
6.25 + -5x + x2 = 30 + 6.25

Combine like terms: 30 + 6.25 = 36.25
6.25 + -5x + x2 = 36.25

Factor a perfect square on the left side:
(x + -2.5)(x + -2.5) = 36.25

Calculate the square root of the right side: 6.020797289

Break this problem into two subproblems by setting 
(x + -2.5) equal to 6.020797289 and -6.020797289.

Subproblem 1

x + -2.5 = 6.020797289 Simplifying x + -2.5 = 6.020797289 Reorder the terms: -2.5 + x = 6.020797289 Solving -2.5 + x = 6.020797289 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + x = 6.020797289 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = 6.020797289 + 2.5 x = 6.020797289 + 2.5 Combine like terms: 6.020797289 + 2.5 = 8.520797289 x = 8.520797289 Simplifying x = 8.520797289

Subproblem 2

x + -2.5 = -6.020797289 Simplifying x + -2.5 = -6.020797289 Reorder the terms: -2.5 + x = -6.020797289 Solving -2.5 + x = -6.020797289 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + x = -6.020797289 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = -6.020797289 + 2.5 x = -6.020797289 + 2.5 Combine like terms: -6.020797289 + 2.5 = -3.520797289 x = -3.520797289 Simplifying x = -3.520797289

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.520797289, -3.520797289}

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