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

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


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

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

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

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

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

Solving
-32 + -4x + x2 = x

Solving for variable 'x'.

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

Combine like terms: -4x + -1x = -5x
-32 + -5x + x2 = x + -1x

Combine like terms: x + -1x = 0
-32 + -5x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '32' to each side of the equation.
-32 + -5x + 32 + x2 = 0 + 32

Reorder the terms:
-32 + 32 + -5x + x2 = 0 + 32

Combine like terms: -32 + 32 = 0
0 + -5x + x2 = 0 + 32
-5x + x2 = 0 + 32

Combine like terms: 0 + 32 = 32
-5x + x2 = 32

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 = 32 + 6.25

Reorder the terms:
6.25 + -5x + x2 = 32 + 6.25

Combine like terms: 32 + 6.25 = 38.25
6.25 + -5x + x2 = 38.25

Factor a perfect square on the left side:
(x + -2.5)(x + -2.5) = 38.25

Calculate the square root of the right side: 6.184658438

Break this problem into two subproblems by setting 
(x + -2.5) equal to 6.184658438 and -6.184658438.

Subproblem 1

x + -2.5 = 6.184658438 Simplifying x + -2.5 = 6.184658438 Reorder the terms: -2.5 + x = 6.184658438 Solving -2.5 + x = 6.184658438 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 = 6.184658438 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = 6.184658438 + 2.5 x = 6.184658438 + 2.5 Combine like terms: 6.184658438 + 2.5 = 8.684658438 x = 8.684658438 Simplifying x = 8.684658438

Subproblem 2

x + -2.5 = -6.184658438 Simplifying x + -2.5 = -6.184658438 Reorder the terms: -2.5 + x = -6.184658438 Solving -2.5 + x = -6.184658438 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 = -6.184658438 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = -6.184658438 + 2.5 x = -6.184658438 + 2.5 Combine like terms: -6.184658438 + 2.5 = -3.684658438 x = -3.684658438 Simplifying x = -3.684658438

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.684658438, -3.684658438}

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