256=(4+x)(2+x)

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Solution for 256=(4+x)(2+x) equation:


Simplifying
256 = (4 + x)(2 + x)

Multiply (4 + x) * (2 + x)
256 = (4(2 + x) + x(2 + x))
256 = ((2 * 4 + x * 4) + x(2 + x))
256 = ((8 + 4x) + x(2 + x))
256 = (8 + 4x + (2 * x + x * x))
256 = (8 + 4x + (2x + x2))

Combine like terms: 4x + 2x = 6x
256 = (8 + 6x + x2)

Solving
256 = 8 + 6x + x2

Solving for variable 'x'.

Combine like terms: 256 + -8 = 248
248 + -6x + -1x2 = 8 + 6x + x2 + -8 + -6x + -1x2

Reorder the terms:
248 + -6x + -1x2 = 8 + -8 + 6x + -6x + x2 + -1x2

Combine like terms: 8 + -8 = 0
248 + -6x + -1x2 = 0 + 6x + -6x + x2 + -1x2
248 + -6x + -1x2 = 6x + -6x + x2 + -1x2

Combine like terms: 6x + -6x = 0
248 + -6x + -1x2 = 0 + x2 + -1x2
248 + -6x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
248 + -6x + -1x2 = 0

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

Divide each side by '-1'.
-248 + 6x + x2 = 0

Move the constant term to the right:

Add '248' to each side of the equation.
-248 + 6x + 248 + x2 = 0 + 248

Reorder the terms:
-248 + 248 + 6x + x2 = 0 + 248

Combine like terms: -248 + 248 = 0
0 + 6x + x2 = 0 + 248
6x + x2 = 0 + 248

Combine like terms: 0 + 248 = 248
6x + x2 = 248

The x term is 6x.  Take half its coefficient (3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
6x + 9 + x2 = 248 + 9

Reorder the terms:
9 + 6x + x2 = 248 + 9

Combine like terms: 248 + 9 = 257
9 + 6x + x2 = 257

Factor a perfect square on the left side:
(x + 3)(x + 3) = 257

Calculate the square root of the right side: 16.031219542

Break this problem into two subproblems by setting 
(x + 3) equal to 16.031219542 and -16.031219542.

Subproblem 1

x + 3 = 16.031219542 Simplifying x + 3 = 16.031219542 Reorder the terms: 3 + x = 16.031219542 Solving 3 + x = 16.031219542 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x = 16.031219542 + -3 Combine like terms: 3 + -3 = 0 0 + x = 16.031219542 + -3 x = 16.031219542 + -3 Combine like terms: 16.031219542 + -3 = 13.031219542 x = 13.031219542 Simplifying x = 13.031219542

Subproblem 2

x + 3 = -16.031219542 Simplifying x + 3 = -16.031219542 Reorder the terms: 3 + x = -16.031219542 Solving 3 + x = -16.031219542 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x = -16.031219542 + -3 Combine like terms: 3 + -3 = 0 0 + x = -16.031219542 + -3 x = -16.031219542 + -3 Combine like terms: -16.031219542 + -3 = -19.031219542 x = -19.031219542 Simplifying x = -19.031219542

Solution

The solution to the problem is based on the solutions from the subproblems. x = {13.031219542, -19.031219542}

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