10r^2+10r+2=0

Solution for 10r^2+10r+2=0 equation:

Simplifying
10r2 + 10r + 2 = 0

Reorder the terms:
2 + 10r + 10r2 = 0

Solving
2 + 10r + 10r2 = 0

Solving for variable 'r'.

Factor out the Greatest Common Factor (GCF), '2'.
2(1 + 5r + 5r2) = 0

Ignore the factor 2.
Subproblem 1
Set the factor '(1 + 5r + 5r2)' equal to zero and attempt to solve:

Simplifying
1 + 5r + 5r2 = 0

Solving
1 + 5r + 5r2 = 0

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

Divide each side by '5'.
0.2 + r + r2 = 0

Move the constant term to the right:

Add '-0.2' to each side of the equation.
0.2 + r + -0.2 + r2 = 0 + -0.2

Reorder the terms:
0.2 + -0.2 + r + r2 = 0 + -0.2

Combine like terms: 0.2 + -0.2 = 0.0
0.0 + r + r2 = 0 + -0.2
r + r2 = 0 + -0.2

Combine like terms: 0 + -0.2 = -0.2
r + r2 = -0.2

The r term is r.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
 + 0.25 + r2 = -0.2 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + r2 = -0.2 + 0.25

Combine like terms: -0.2 + 0.25 = 0.05
1.25 + r2 = 0.05

Factor a perfect square on the left side:
(r + 0.5)(r + 0.5) = 0.05

Calculate the square root of the right side: 0.223606798

Break this problem into two subproblems by setting 
(r + 0.5) equal to 0.223606798 and -0.223606798.

Subproblem 1
r + 0.5 = 0.223606798

Simplifying
r + 0.5 = 0.223606798

Reorder the terms:
0.5 + r = 0.223606798

Solving
0.5 + r = 0.223606798

Solving for variable 'r'.

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

Add '-0.5' to each side of the equation.
0.5 + -0.5 + r = 0.223606798 + -0.5

Combine like terms: 0.5 + -0.5 = 0.0
0.0 + r = 0.223606798 + -0.5
r = 0.223606798 + -0.5

Combine like terms: 0.223606798 + -0.5 = -0.276393202
r = -0.276393202

Simplifying
r = -0.276393202

Subproblem 2
r + 0.5 = -0.223606798

Simplifying
r + 0.5 = -0.223606798

Reorder the terms:
0.5 + r = -0.223606798

Solving
0.5 + r = -0.223606798

Solving for variable 'r'.

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

Add '-0.5' to each side of the equation.
0.5 + -0.5 + r = -0.223606798 + -0.5

Combine like terms: 0.5 + -0.5 = 0.0
0.0 + r = -0.223606798 + -0.5
r = -0.223606798 + -0.5

Combine like terms: -0.223606798 + -0.5 = -0.723606798
r = -0.723606798

Simplifying
r = -0.723606798

Solution
The solution to the problem is based on the solutions
from the subproblems.
r = {-0.276393202, -0.723606798}
Solution
r = {-0.276393202, -0.723606798}