(x+6)(2x-4)=939

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Solution for (x+6)(2x-4)=939 equation:


Simplifying
(x + 6)(2x + -4) = 939

Reorder the terms:
(6 + x)(2x + -4) = 939

Reorder the terms:
(6 + x)(-4 + 2x) = 939

Multiply (6 + x) * (-4 + 2x)
(6(-4 + 2x) + x(-4 + 2x)) = 939
((-4 * 6 + 2x * 6) + x(-4 + 2x)) = 939
((-24 + 12x) + x(-4 + 2x)) = 939
(-24 + 12x + (-4 * x + 2x * x)) = 939
(-24 + 12x + (-4x + 2x2)) = 939

Combine like terms: 12x + -4x = 8x
(-24 + 8x + 2x2) = 939

Solving
-24 + 8x + 2x2 = 939

Solving for variable 'x'.

Reorder the terms:
-24 + -939 + 8x + 2x2 = 939 + -939

Combine like terms: -24 + -939 = -963
-963 + 8x + 2x2 = 939 + -939

Combine like terms: 939 + -939 = 0
-963 + 8x + 2x2 = 0

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

Divide each side by '2'.
-481.5 + 4x + x2 = 0

Move the constant term to the right:

Add '481.5' to each side of the equation.
-481.5 + 4x + 481.5 + x2 = 0 + 481.5

Reorder the terms:
-481.5 + 481.5 + 4x + x2 = 0 + 481.5

Combine like terms: -481.5 + 481.5 = 0.0
0.0 + 4x + x2 = 0 + 481.5
4x + x2 = 0 + 481.5

Combine like terms: 0 + 481.5 = 481.5
4x + x2 = 481.5

The x term is 4x.  Take half its coefficient (2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
4x + 4 + x2 = 481.5 + 4

Reorder the terms:
4 + 4x + x2 = 481.5 + 4

Combine like terms: 481.5 + 4 = 485.5
4 + 4x + x2 = 485.5

Factor a perfect square on the left side:
(x + 2)(x + 2) = 485.5

Calculate the square root of the right side: 22.034064537

Break this problem into two subproblems by setting 
(x + 2) equal to 22.034064537 and -22.034064537.

Subproblem 1

x + 2 = 22.034064537 Simplifying x + 2 = 22.034064537 Reorder the terms: 2 + x = 22.034064537 Solving 2 + x = 22.034064537 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = 22.034064537 + -2 Combine like terms: 2 + -2 = 0 0 + x = 22.034064537 + -2 x = 22.034064537 + -2 Combine like terms: 22.034064537 + -2 = 20.034064537 x = 20.034064537 Simplifying x = 20.034064537

Subproblem 2

x + 2 = -22.034064537 Simplifying x + 2 = -22.034064537 Reorder the terms: 2 + x = -22.034064537 Solving 2 + x = -22.034064537 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = -22.034064537 + -2 Combine like terms: 2 + -2 = 0 0 + x = -22.034064537 + -2 x = -22.034064537 + -2 Combine like terms: -22.034064537 + -2 = -24.034064537 x = -24.034064537 Simplifying x = -24.034064537

Solution

The solution to the problem is based on the solutions from the subproblems. x = {20.034064537, -24.034064537}

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