(x-4)(-x+8)=2

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Solution for (x-4)(-x+8)=2 equation:


Simplifying
(x + -4)(-1x + 8) = 2

Reorder the terms:
(-4 + x)(-1x + 8) = 2

Reorder the terms:
(-4 + x)(8 + -1x) = 2

Multiply (-4 + x) * (8 + -1x)
(-4(8 + -1x) + x(8 + -1x)) = 2
((8 * -4 + -1x * -4) + x(8 + -1x)) = 2
((-32 + 4x) + x(8 + -1x)) = 2
(-32 + 4x + (8 * x + -1x * x)) = 2
(-32 + 4x + (8x + -1x2)) = 2

Combine like terms: 4x + 8x = 12x
(-32 + 12x + -1x2) = 2

Solving
-32 + 12x + -1x2 = 2

Solving for variable 'x'.

Reorder the terms:
-32 + -2 + 12x + -1x2 = 2 + -2

Combine like terms: -32 + -2 = -34
-34 + 12x + -1x2 = 2 + -2

Combine like terms: 2 + -2 = 0
-34 + 12x + -1x2 = 0

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

Divide each side by '-1'.
34 + -12x + x2 = 0

Move the constant term to the right:

Add '-34' to each side of the equation.
34 + -12x + -34 + x2 = 0 + -34

Reorder the terms:
34 + -34 + -12x + x2 = 0 + -34

Combine like terms: 34 + -34 = 0
0 + -12x + x2 = 0 + -34
-12x + x2 = 0 + -34

Combine like terms: 0 + -34 = -34
-12x + x2 = -34

The x term is -12x.  Take half its coefficient (-6).
Square it (36) and add it to both sides.

Add '36' to each side of the equation.
-12x + 36 + x2 = -34 + 36

Reorder the terms:
36 + -12x + x2 = -34 + 36

Combine like terms: -34 + 36 = 2
36 + -12x + x2 = 2

Factor a perfect square on the left side:
(x + -6)(x + -6) = 2

Calculate the square root of the right side: 1.414213562

Break this problem into two subproblems by setting 
(x + -6) equal to 1.414213562 and -1.414213562.

Subproblem 1

x + -6 = 1.414213562 Simplifying x + -6 = 1.414213562 Reorder the terms: -6 + x = 1.414213562 Solving -6 + x = 1.414213562 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + x = 1.414213562 + 6 Combine like terms: -6 + 6 = 0 0 + x = 1.414213562 + 6 x = 1.414213562 + 6 Combine like terms: 1.414213562 + 6 = 7.414213562 x = 7.414213562 Simplifying x = 7.414213562

Subproblem 2

x + -6 = -1.414213562 Simplifying x + -6 = -1.414213562 Reorder the terms: -6 + x = -1.414213562 Solving -6 + x = -1.414213562 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + x = -1.414213562 + 6 Combine like terms: -6 + 6 = 0 0 + x = -1.414213562 + 6 x = -1.414213562 + 6 Combine like terms: -1.414213562 + 6 = 4.585786438 x = 4.585786438 Simplifying x = 4.585786438

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.414213562, 4.585786438}

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