-2x(x-10)=16

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Solution for -2x(x-10)=16 equation: 


Simplifying
-2x(x + -10) = 16

Reorder the terms:
-2x(-10 + x) = 16
(-10 * -2x + x * -2x) = 16
(20x + -2x2) = 16

Solving
20x + -2x2 = 16

Solving for variable 'x'.

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

Combine like terms: 16 + -16 = 0
-16 + 20x + -2x2 = 0

Factor out the Greatest Common Factor (GCF), '2'.
2(-8 + 10x + -1x2) = 0

Ignore the factor 2.

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

Simplifying
-8 + 10x + -1x2 = 0

Solving
-8 + 10x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
8 + -10x + x2 = 0

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 = 17
25 + -10x + x2 = 17

Factor a perfect square on the left side:
(x + -5)(x + -5) = 17

Calculate the square root of the right side: 4.123105626

Break this problem into two subproblems by setting 
(x + -5) equal to 4.123105626 and -4.123105626.


Subproblem 1
x + -5 = 4.123105626

Simplifying
x + -5 = 4.123105626

Reorder the terms:
-5 + x = 4.123105626

Solving
-5 + x = 4.123105626

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 = 4.123105626 + 5

Combine like terms: -5 + 5 = 0
0 + x = 4.123105626 + 5
x = 4.123105626 + 5

Combine like terms: 4.123105626 + 5 = 9.123105626
x = 9.123105626

Simplifying
x = 9.123105626


Subproblem 2
x + -5 = -4.123105626

Simplifying
x + -5 = -4.123105626

Reorder the terms:
-5 + x = -4.123105626

Solving
-5 + x = -4.123105626

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 = -4.123105626 + 5

Combine like terms: -5 + 5 = 0
0 + x = -4.123105626 + 5
x = -4.123105626 + 5

Combine like terms: -4.123105626 + 5 = 0.876894374
x = 0.876894374

Simplifying
x = 0.876894374


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {9.123105626, 0.876894374}
Solution
x = {9.123105626, 0.876894374}

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