5x^2+(10x+2)=0

Solution for 5x^2+(10x+2)=0 equation:

Simplifying
5x2 + (10x + 2) = 0

Reorder the terms:
5x2 + (2 + 10x) = 0

Remove parenthesis around (2 + 10x)
5x2 + 2 + 10x = 0

Reorder the terms:
2 + 10x + 5x2 = 0

Solving
2 + 10x + 5x2 = 0

Solving for variable 'x'.

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

Divide each side by '5'.
0.4 + 2x + x2 = 0

Move the constant term to the right:

Add '-0.4' to each side of the equation.
0.4 + 2x + -0.4 + x2 = 0 + -0.4

Reorder the terms:
0.4 + -0.4 + 2x + x2 = 0 + -0.4

Combine like terms: 0.4 + -0.4 = 0.0
0.0 + 2x + x2 = 0 + -0.4
2x + x2 = 0 + -0.4

Combine like terms: 0 + -0.4 = -0.4
2x + x2 = -0.4

The x term is 2x.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2x + 1 + x2 = -0.4 + 1

Reorder the terms:
1 + 2x + x2 = -0.4 + 1

Combine like terms: -0.4 + 1 = 0.6
1 + 2x + x2 = 0.6

Factor a perfect square on the left side:
(x + 1)(x + 1) = 0.6

Calculate the square root of the right side: 0.774596669

Break this problem into two subproblems by setting 
(x + 1) equal to 0.774596669 and -0.774596669.

Subproblem 1
x + 1 = 0.774596669

Simplifying
x + 1 = 0.774596669

Reorder the terms:
1 + x = 0.774596669

Solving
1 + x = 0.774596669

Solving for variable 'x'.

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

Add '-1' to each side of the equation.
1 + -1 + x = 0.774596669 + -1

Combine like terms: 1 + -1 = 0
0 + x = 0.774596669 + -1
x = 0.774596669 + -1

Combine like terms: 0.774596669 + -1 = -0.225403331
x = -0.225403331

Simplifying
x = -0.225403331

Subproblem 2
x + 1 = -0.774596669

Simplifying
x + 1 = -0.774596669

Reorder the terms:
1 + x = -0.774596669

Solving
1 + x = -0.774596669

Solving for variable 'x'.

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

Add '-1' to each side of the equation.
1 + -1 + x = -0.774596669 + -1

Combine like terms: 1 + -1 = 0
0 + x = -0.774596669 + -1
x = -0.774596669 + -1

Combine like terms: -0.774596669 + -1 = -1.774596669
x = -1.774596669

Simplifying
x = -1.774596669

Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {-0.225403331, -1.774596669}