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

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Solution for (x+8)(4-x)=(2x-1) equation:


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

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

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

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

Reorder the terms:
32 + -4x + -1x2 = (-1 + 2x)

Remove parenthesis around (-1 + 2x)
32 + -4x + -1x2 = -1 + 2x

Solving
32 + -4x + -1x2 = -1 + 2x

Solving for variable 'x'.

Reorder the terms:
32 + 1 + -4x + -2x + -1x2 = -1 + 2x + 1 + -2x

Combine like terms: 32 + 1 = 33
33 + -4x + -2x + -1x2 = -1 + 2x + 1 + -2x

Combine like terms: -4x + -2x = -6x
33 + -6x + -1x2 = -1 + 2x + 1 + -2x

Reorder the terms:
33 + -6x + -1x2 = -1 + 1 + 2x + -2x

Combine like terms: -1 + 1 = 0
33 + -6x + -1x2 = 0 + 2x + -2x
33 + -6x + -1x2 = 2x + -2x

Combine like terms: 2x + -2x = 0
33 + -6x + -1x2 = 0

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

Divide each side by '-1'.
-33 + 6x + x2 = 0

Move the constant term to the right:

Add '33' to each side of the equation.
-33 + 6x + 33 + x2 = 0 + 33

Reorder the terms:
-33 + 33 + 6x + x2 = 0 + 33

Combine like terms: -33 + 33 = 0
0 + 6x + x2 = 0 + 33
6x + x2 = 0 + 33

Combine like terms: 0 + 33 = 33
6x + x2 = 33

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 = 33 + 9

Reorder the terms:
9 + 6x + x2 = 33 + 9

Combine like terms: 33 + 9 = 42
9 + 6x + x2 = 42

Factor a perfect square on the left side:
(x + 3)(x + 3) = 42

Calculate the square root of the right side: 6.480740698

Break this problem into two subproblems by setting 
(x + 3) equal to 6.480740698 and -6.480740698.

Subproblem 1

x + 3 = 6.480740698 Simplifying x + 3 = 6.480740698 Reorder the terms: 3 + x = 6.480740698 Solving 3 + x = 6.480740698 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 = 6.480740698 + -3 Combine like terms: 3 + -3 = 0 0 + x = 6.480740698 + -3 x = 6.480740698 + -3 Combine like terms: 6.480740698 + -3 = 3.480740698 x = 3.480740698 Simplifying x = 3.480740698

Subproblem 2

x + 3 = -6.480740698 Simplifying x + 3 = -6.480740698 Reorder the terms: 3 + x = -6.480740698 Solving 3 + x = -6.480740698 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 = -6.480740698 + -3 Combine like terms: 3 + -3 = 0 0 + x = -6.480740698 + -3 x = -6.480740698 + -3 Combine like terms: -6.480740698 + -3 = -9.480740698 x = -9.480740698 Simplifying x = -9.480740698

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.480740698, -9.480740698}

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