2(x*x)+20x-16=0

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Solution for 2(x*x)+20x-16=0 equation: 


Simplifying
2(x * x) + 20x + -16 = 0

Multiply x * x
2(x2) + 20x + -16 = 0

Reorder the terms:
-16 + 20x + 2x2 = 0

Solving
-16 + 20x + 2x2 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), '2'.
2(-8 + 10x + x2) = 0

Ignore the factor 2.

Subproblem 1
Set the factor '(-8 + 10x + x2)' equal to zero and attempt to solve:

Simplifying
-8 + 10x + x2 = 0

Solving
-8 + 10x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '8' to each side of the equation.
-8 + 10x + 8 + x2 = 0 + 8

Reorder the terms:
-8 + 8 + 10x + x2 = 0 + 8

Combine like terms: -8 + 8 = 0
0 + 10x + x2 = 0 + 8
10x + x2 = 0 + 8

Combine like terms: 0 + 8 = 8
10x + x2 = 8

The x term is 10x.  Take half its coefficient (5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
10x + 25 + x2 = 8 + 25

Reorder the terms:
25 + 10x + x2 = 8 + 25

Combine like terms: 8 + 25 = 33
25 + 10x + x2 = 33

Factor a perfect square on the left side:
(x + 5)(x + 5) = 33

Calculate the square root of the right side: 5.744562647

Break this problem into two subproblems by setting 
(x + 5) equal to 5.744562647 and -5.744562647.


Subproblem 1
x + 5 = 5.744562647

Simplifying
x + 5 = 5.744562647

Reorder the terms:
5 + x = 5.744562647

Solving
5 + x = 5.744562647

Solving for variable 'x'.

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

Add '-5' to each side of the equation.
5 + -5 + x = 5.744562647 + -5

Combine like terms: 5 + -5 = 0
0 + x = 5.744562647 + -5
x = 5.744562647 + -5

Combine like terms: 5.744562647 + -5 = 0.744562647
x = 0.744562647

Simplifying
x = 0.744562647


Subproblem 2
x + 5 = -5.744562647

Simplifying
x + 5 = -5.744562647

Reorder the terms:
5 + x = -5.744562647

Solving
5 + x = -5.744562647

Solving for variable 'x'.

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

Add '-5' to each side of the equation.
5 + -5 + x = -5.744562647 + -5

Combine like terms: 5 + -5 = 0
0 + x = -5.744562647 + -5
x = -5.744562647 + -5

Combine like terms: -5.744562647 + -5 = -10.744562647
x = -10.744562647

Simplifying
x = -10.744562647


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {0.744562647, -10.744562647}
Solution
x = {0.744562647, -10.744562647}

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