56=(x+3-4)(x-4)

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Solution for 56=(x+3-4)(x-4) equation:


Simplifying
56 = (x + 3 + -4)(x + -4)

Reorder the terms:
56 = (3 + -4 + x)(x + -4)

Combine like terms: 3 + -4 = -1
56 = (-1 + x)(x + -4)

Reorder the terms:
56 = (-1 + x)(-4 + x)

Multiply (-1 + x) * (-4 + x)
56 = (-1(-4 + x) + x(-4 + x))
56 = ((-4 * -1 + x * -1) + x(-4 + x))
56 = ((4 + -1x) + x(-4 + x))
56 = (4 + -1x + (-4 * x + x * x))
56 = (4 + -1x + (-4x + x2))

Combine like terms: -1x + -4x = -5x
56 = (4 + -5x + x2)

Solving
56 = 4 + -5x + x2

Solving for variable 'x'.

Combine like terms: 56 + -4 = 52
52 + 5x + -1x2 = 4 + -5x + x2 + -4 + 5x + -1x2

Reorder the terms:
52 + 5x + -1x2 = 4 + -4 + -5x + 5x + x2 + -1x2

Combine like terms: 4 + -4 = 0
52 + 5x + -1x2 = 0 + -5x + 5x + x2 + -1x2
52 + 5x + -1x2 = -5x + 5x + x2 + -1x2

Combine like terms: -5x + 5x = 0
52 + 5x + -1x2 = 0 + x2 + -1x2
52 + 5x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
52 + 5x + -1x2 = 0

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

Divide each side by '-1'.
-52 + -5x + x2 = 0

Move the constant term to the right:

Add '52' to each side of the equation.
-52 + -5x + 52 + x2 = 0 + 52

Reorder the terms:
-52 + 52 + -5x + x2 = 0 + 52

Combine like terms: -52 + 52 = 0
0 + -5x + x2 = 0 + 52
-5x + x2 = 0 + 52

Combine like terms: 0 + 52 = 52
-5x + x2 = 52

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 = 52 + 6.25

Reorder the terms:
6.25 + -5x + x2 = 52 + 6.25

Combine like terms: 52 + 6.25 = 58.25
6.25 + -5x + x2 = 58.25

Factor a perfect square on the left side:
(x + -2.5)(x + -2.5) = 58.25

Calculate the square root of the right side: 7.632168761

Break this problem into two subproblems by setting 
(x + -2.5) equal to 7.632168761 and -7.632168761.

Subproblem 1

x + -2.5 = 7.632168761 Simplifying x + -2.5 = 7.632168761 Reorder the terms: -2.5 + x = 7.632168761 Solving -2.5 + x = 7.632168761 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 = 7.632168761 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = 7.632168761 + 2.5 x = 7.632168761 + 2.5 Combine like terms: 7.632168761 + 2.5 = 10.132168761 x = 10.132168761 Simplifying x = 10.132168761

Subproblem 2

x + -2.5 = -7.632168761 Simplifying x + -2.5 = -7.632168761 Reorder the terms: -2.5 + x = -7.632168761 Solving -2.5 + x = -7.632168761 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 = -7.632168761 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = -7.632168761 + 2.5 x = -7.632168761 + 2.5 Combine like terms: -7.632168761 + 2.5 = -5.132168761 x = -5.132168761 Simplifying x = -5.132168761

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.132168761, -5.132168761}

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