x*x+16x+8=0

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Solution for x*x+16x+8=0 equation:


Simplifying
x * x + 16x + 8 = 0

Multiply x * x
x2 + 16x + 8 = 0

Reorder the terms:
8 + 16x + x2 = 0

Solving
8 + 16x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '-8' to each side of the equation.
8 + 16x + -8 + x2 = 0 + -8

Reorder the terms:
8 + -8 + 16x + x2 = 0 + -8

Combine like terms: 8 + -8 = 0
0 + 16x + x2 = 0 + -8
16x + x2 = 0 + -8

Combine like terms: 0 + -8 = -8
16x + x2 = -8

The x term is 16x.  Take half its coefficient (8).
Square it (64) and add it to both sides.

Add '64' to each side of the equation.
16x + 64 + x2 = -8 + 64

Reorder the terms:
64 + 16x + x2 = -8 + 64

Combine like terms: -8 + 64 = 56
64 + 16x + x2 = 56

Factor a perfect square on the left side:
(x + 8)(x + 8) = 56

Calculate the square root of the right side: 7.483314774

Break this problem into two subproblems by setting 
(x + 8) equal to 7.483314774 and -7.483314774.


Subproblem 1
x + 8 = 7.483314774

Simplifying
x + 8 = 7.483314774

Reorder the terms:
8 + x = 7.483314774

Solving
8 + x = 7.483314774

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-8' to each side of the equation.
8 + -8 + x = 7.483314774 + -8

Combine like terms: 8 + -8 = 0
0 + x = 7.483314774 + -8
x = 7.483314774 + -8

Combine like terms: 7.483314774 + -8 = -0.516685226
x = -0.516685226

Simplifying
x = -0.516685226


Subproblem 2
x + 8 = -7.483314774

Simplifying
x + 8 = -7.483314774

Reorder the terms:
8 + x = -7.483314774

Solving
8 + x = -7.483314774

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-8' to each side of the equation.
8 + -8 + x = -7.483314774 + -8

Combine like terms: 8 + -8 = 0
0 + x = -7.483314774 + -8
x = -7.483314774 + -8

Combine like terms: -7.483314774 + -8 = -15.483314774
x = -15.483314774

Simplifying
x = -15.483314774


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {-0.516685226, -15.483314774}

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