(x*x)+10x=16

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Solution for (x*x)+10x=16 equation: 


Simplifying
(x * x) + 10x = 16

Multiply x * x
(x2) + 10x = 16
x2 + 10x = 16

Reorder the terms:
10x + x2 = 16

Solving
10x + x2 = 16

Solving for variable 'x'.

Reorder the terms:
-16 + 10x + x2 = 16 + -16

Combine like terms: 16 + -16 = 0
-16 + 10x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '16' to each side of the equation.
-16 + 10x + 16 + x2 = 0 + 16

Reorder the terms:
-16 + 16 + 10x + x2 = 0 + 16

Combine like terms: -16 + 16 = 0
0 + 10x + x2 = 0 + 16
10x + x2 = 0 + 16

Combine like terms: 0 + 16 = 16
10x + x2 = 16

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 = 16 + 25

Reorder the terms:
25 + 10x + x2 = 16 + 25

Combine like terms: 16 + 25 = 41
25 + 10x + x2 = 41

Factor a perfect square on the left side:
(x + 5)(x + 5) = 41

Calculate the square root of the right side: 6.403124237

Break this problem into two subproblems by setting 
(x + 5) equal to 6.403124237 and -6.403124237.


Subproblem 1
x + 5 = 6.403124237

Simplifying
x + 5 = 6.403124237

Reorder the terms:
5 + x = 6.403124237

Solving
5 + x = 6.403124237

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 = 6.403124237 + -5

Combine like terms: 5 + -5 = 0
0 + x = 6.403124237 + -5
x = 6.403124237 + -5

Combine like terms: 6.403124237 + -5 = 1.403124237
x = 1.403124237

Simplifying
x = 1.403124237


Subproblem 2
x + 5 = -6.403124237

Simplifying
x + 5 = -6.403124237

Reorder the terms:
5 + x = -6.403124237

Solving
5 + x = -6.403124237

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 = -6.403124237 + -5

Combine like terms: 5 + -5 = 0
0 + x = -6.403124237 + -5
x = -6.403124237 + -5

Combine like terms: -6.403124237 + -5 = -11.403124237
x = -11.403124237

Simplifying
x = -11.403124237


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {1.403124237, -11.403124237}

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