12=(x+6)(2x-1)

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Solution for 12=(x+6)(2x-1) equation:


Simplifying
12 = (x + 6)(2x + -1)

Reorder the terms:
12 = (6 + x)(2x + -1)

Reorder the terms:
12 = (6 + x)(-1 + 2x)

Multiply (6 + x) * (-1 + 2x)
12 = (6(-1 + 2x) + x(-1 + 2x))
12 = ((-1 * 6 + 2x * 6) + x(-1 + 2x))
12 = ((-6 + 12x) + x(-1 + 2x))
12 = (-6 + 12x + (-1 * x + 2x * x))
12 = (-6 + 12x + (-1x + 2x2))

Combine like terms: 12x + -1x = 11x
12 = (-6 + 11x + 2x2)

Solving
12 = -6 + 11x + 2x2

Solving for variable 'x'.

Combine like terms: 12 + 6 = 18
18 + -11x + -2x2 = -6 + 11x + 2x2 + 6 + -11x + -2x2

Reorder the terms:
18 + -11x + -2x2 = -6 + 6 + 11x + -11x + 2x2 + -2x2

Combine like terms: -6 + 6 = 0
18 + -11x + -2x2 = 0 + 11x + -11x + 2x2 + -2x2
18 + -11x + -2x2 = 11x + -11x + 2x2 + -2x2

Combine like terms: 11x + -11x = 0
18 + -11x + -2x2 = 0 + 2x2 + -2x2
18 + -11x + -2x2 = 2x2 + -2x2

Combine like terms: 2x2 + -2x2 = 0
18 + -11x + -2x2 = 0

Begin completing the square.  Divide all terms by
-2 the coefficient of the squared term: 

Divide each side by '-2'.
-9 + 5.5x + x2 = 0

Move the constant term to the right:

Add '9' to each side of the equation.
-9 + 5.5x + 9 + x2 = 0 + 9

Reorder the terms:
-9 + 9 + 5.5x + x2 = 0 + 9

Combine like terms: -9 + 9 = 0
0 + 5.5x + x2 = 0 + 9
5.5x + x2 = 0 + 9

Combine like terms: 0 + 9 = 9
5.5x + x2 = 9

The x term is 5.5x.  Take half its coefficient (2.75).
Square it (7.5625) and add it to both sides.

Add '7.5625' to each side of the equation.
5.5x + 7.5625 + x2 = 9 + 7.5625

Reorder the terms:
7.5625 + 5.5x + x2 = 9 + 7.5625

Combine like terms: 9 + 7.5625 = 16.5625
7.5625 + 5.5x + x2 = 16.5625

Factor a perfect square on the left side:
(x + 2.75)(x + 2.75) = 16.5625

Calculate the square root of the right side: 4.069705149

Break this problem into two subproblems by setting 
(x + 2.75) equal to 4.069705149 and -4.069705149.

Subproblem 1

x + 2.75 = 4.069705149 Simplifying x + 2.75 = 4.069705149 Reorder the terms: 2.75 + x = 4.069705149 Solving 2.75 + x = 4.069705149 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.75' to each side of the equation. 2.75 + -2.75 + x = 4.069705149 + -2.75 Combine like terms: 2.75 + -2.75 = 0.00 0.00 + x = 4.069705149 + -2.75 x = 4.069705149 + -2.75 Combine like terms: 4.069705149 + -2.75 = 1.319705149 x = 1.319705149 Simplifying x = 1.319705149

Subproblem 2

x + 2.75 = -4.069705149 Simplifying x + 2.75 = -4.069705149 Reorder the terms: 2.75 + x = -4.069705149 Solving 2.75 + x = -4.069705149 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.75' to each side of the equation. 2.75 + -2.75 + x = -4.069705149 + -2.75 Combine like terms: 2.75 + -2.75 = 0.00 0.00 + x = -4.069705149 + -2.75 x = -4.069705149 + -2.75 Combine like terms: -4.069705149 + -2.75 = -6.819705149 x = -6.819705149 Simplifying x = -6.819705149

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.319705149, -6.819705149}

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