(3+x)(x-8)=8

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Solution for (3+x)(x-8)=8 equation: 


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

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

Multiply (3 + x) * (-8 + x)
(3(-8 + x) + x(-8 + x)) = 8
((-8 * 3 + x * 3) + x(-8 + x)) = 8
((-24 + 3x) + x(-8 + x)) = 8
(-24 + 3x + (-8 * x + x * x)) = 8
(-24 + 3x + (-8x + x2)) = 8

Combine like terms: 3x + -8x = -5x
(-24 + -5x + x2) = 8

Solving
-24 + -5x + x2 = 8

Solving for variable 'x'.

Reorder the terms:
-24 + -8 + -5x + x2 = 8 + -8

Combine like terms: -24 + -8 = -32
-32 + -5x + x2 = 8 + -8

Combine like terms: 8 + -8 = 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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