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

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


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

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

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

Multiply (8 + x) * (-8 + 2x)
x = (8(-8 + 2x) + x(-8 + 2x))
x = ((-8 * 8 + 2x * 8) + x(-8 + 2x))
x = ((-64 + 16x) + x(-8 + 2x))
x = (-64 + 16x + (-8 * x + 2x * x))
x = (-64 + 16x + (-8x + 2x2))

Combine like terms: 16x + -8x = 8x
x = (-64 + 8x + 2x2)

Solving
x = -64 + 8x + 2x2

Solving for variable 'x'.

Reorder the terms:
64 + x + -8x + -2x2 = -64 + 8x + 2x2 + 64 + -8x + -2x2

Combine like terms: x + -8x = -7x
64 + -7x + -2x2 = -64 + 8x + 2x2 + 64 + -8x + -2x2

Reorder the terms:
64 + -7x + -2x2 = -64 + 64 + 8x + -8x + 2x2 + -2x2

Combine like terms: -64 + 64 = 0
64 + -7x + -2x2 = 0 + 8x + -8x + 2x2 + -2x2
64 + -7x + -2x2 = 8x + -8x + 2x2 + -2x2

Combine like terms: 8x + -8x = 0
64 + -7x + -2x2 = 0 + 2x2 + -2x2
64 + -7x + -2x2 = 2x2 + -2x2

Combine like terms: 2x2 + -2x2 = 0
64 + -7x + -2x2 = 0

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

Divide each side by '-2'.
-32 + 3.5x + x2 = 0

Move the constant term to the right:

Add '32' to each side of the equation.
-32 + 3.5x + 32 + x2 = 0 + 32

Reorder the terms:
-32 + 32 + 3.5x + x2 = 0 + 32

Combine like terms: -32 + 32 = 0
0 + 3.5x + x2 = 0 + 32
3.5x + x2 = 0 + 32

Combine like terms: 0 + 32 = 32
3.5x + x2 = 32

The x term is 3.5x.  Take half its coefficient (1.75).
Square it (3.0625) and add it to both sides.

Add '3.0625' to each side of the equation.
3.5x + 3.0625 + x2 = 32 + 3.0625

Reorder the terms:
3.0625 + 3.5x + x2 = 32 + 3.0625

Combine like terms: 32 + 3.0625 = 35.0625
3.0625 + 3.5x + x2 = 35.0625

Factor a perfect square on the left side:
(x + 1.75)(x + 1.75) = 35.0625

Calculate the square root of the right side: 5.921359641

Break this problem into two subproblems by setting 
(x + 1.75) equal to 5.921359641 and -5.921359641.

Subproblem 1

x + 1.75 = 5.921359641 Simplifying x + 1.75 = 5.921359641 Reorder the terms: 1.75 + x = 5.921359641 Solving 1.75 + x = 5.921359641 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.75' to each side of the equation. 1.75 + -1.75 + x = 5.921359641 + -1.75 Combine like terms: 1.75 + -1.75 = 0.00 0.00 + x = 5.921359641 + -1.75 x = 5.921359641 + -1.75 Combine like terms: 5.921359641 + -1.75 = 4.171359641 x = 4.171359641 Simplifying x = 4.171359641

Subproblem 2

x + 1.75 = -5.921359641 Simplifying x + 1.75 = -5.921359641 Reorder the terms: 1.75 + x = -5.921359641 Solving 1.75 + x = -5.921359641 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.75' to each side of the equation. 1.75 + -1.75 + x = -5.921359641 + -1.75 Combine like terms: 1.75 + -1.75 = 0.00 0.00 + x = -5.921359641 + -1.75 x = -5.921359641 + -1.75 Combine like terms: -5.921359641 + -1.75 = -7.671359641 x = -7.671359641 Simplifying x = -7.671359641

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.171359641, -7.671359641}

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