11=(3x+2)(2x-8)

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Solution for 11=(3x+2)(2x-8) equation:


Simplifying
11 = (3x + 2)(2x + -8)

Reorder the terms:
11 = (2 + 3x)(2x + -8)

Reorder the terms:
11 = (2 + 3x)(-8 + 2x)

Multiply (2 + 3x) * (-8 + 2x)
11 = (2(-8 + 2x) + 3x * (-8 + 2x))
11 = ((-8 * 2 + 2x * 2) + 3x * (-8 + 2x))
11 = ((-16 + 4x) + 3x * (-8 + 2x))
11 = (-16 + 4x + (-8 * 3x + 2x * 3x))
11 = (-16 + 4x + (-24x + 6x2))

Combine like terms: 4x + -24x = -20x
11 = (-16 + -20x + 6x2)

Solving
11 = -16 + -20x + 6x2

Solving for variable 'x'.

Combine like terms: 11 + 16 = 27
27 + 20x + -6x2 = -16 + -20x + 6x2 + 16 + 20x + -6x2

Reorder the terms:
27 + 20x + -6x2 = -16 + 16 + -20x + 20x + 6x2 + -6x2

Combine like terms: -16 + 16 = 0
27 + 20x + -6x2 = 0 + -20x + 20x + 6x2 + -6x2
27 + 20x + -6x2 = -20x + 20x + 6x2 + -6x2

Combine like terms: -20x + 20x = 0
27 + 20x + -6x2 = 0 + 6x2 + -6x2
27 + 20x + -6x2 = 6x2 + -6x2

Combine like terms: 6x2 + -6x2 = 0
27 + 20x + -6x2 = 0

Begin completing the square.  Divide all terms by
-6 the coefficient of the squared term: 

Divide each side by '-6'.
-4.5 + -3.333333333x + x2 = 0

Move the constant term to the right:

Add '4.5' to each side of the equation.
-4.5 + -3.333333333x + 4.5 + x2 = 0 + 4.5

Reorder the terms:
-4.5 + 4.5 + -3.333333333x + x2 = 0 + 4.5

Combine like terms: -4.5 + 4.5 = 0.0
0.0 + -3.333333333x + x2 = 0 + 4.5
-3.333333333x + x2 = 0 + 4.5

Combine like terms: 0 + 4.5 = 4.5
-3.333333333x + x2 = 4.5

The x term is -3.333333333x.  Take half its coefficient (-1.666666667).
Square it (2.777777779) and add it to both sides.

Add '2.777777779' to each side of the equation.
-3.333333333x + 2.777777779 + x2 = 4.5 + 2.777777779

Reorder the terms:
2.777777779 + -3.333333333x + x2 = 4.5 + 2.777777779

Combine like terms: 4.5 + 2.777777779 = 7.277777779
2.777777779 + -3.333333333x + x2 = 7.277777779

Factor a perfect square on the left side:
(x + -1.666666667)(x + -1.666666667) = 7.277777779

Calculate the square root of the right side: 2.697735676

Break this problem into two subproblems by setting 
(x + -1.666666667) equal to 2.697735676 and -2.697735676.

Subproblem 1

x + -1.666666667 = 2.697735676 Simplifying x + -1.666666667 = 2.697735676 Reorder the terms: -1.666666667 + x = 2.697735676 Solving -1.666666667 + x = 2.697735676 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.666666667' to each side of the equation. -1.666666667 + 1.666666667 + x = 2.697735676 + 1.666666667 Combine like terms: -1.666666667 + 1.666666667 = 0.000000000 0.000000000 + x = 2.697735676 + 1.666666667 x = 2.697735676 + 1.666666667 Combine like terms: 2.697735676 + 1.666666667 = 4.364402343 x = 4.364402343 Simplifying x = 4.364402343

Subproblem 2

x + -1.666666667 = -2.697735676 Simplifying x + -1.666666667 = -2.697735676 Reorder the terms: -1.666666667 + x = -2.697735676 Solving -1.666666667 + x = -2.697735676 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.666666667' to each side of the equation. -1.666666667 + 1.666666667 + x = -2.697735676 + 1.666666667 Combine like terms: -1.666666667 + 1.666666667 = 0.000000000 0.000000000 + x = -2.697735676 + 1.666666667 x = -2.697735676 + 1.666666667 Combine like terms: -2.697735676 + 1.666666667 = -1.031069009 x = -1.031069009 Simplifying x = -1.031069009

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.364402343, -1.031069009}

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