4y^2=-(10y+2)

Solution for 4y^2=-(10y+2) equation:

Simplifying
4y2 = -1(10y + 2)

Reorder the terms:
4y2 = -1(2 + 10y)
4y2 = (2 * -1 + 10y * -1)
4y2 = (-2 + -10y)

Solving
4y2 = -2 + -10y

Solving for variable 'y'.

Reorder the terms:
2 + 10y + 4y2 = -2 + -10y + 2 + 10y

Reorder the terms:
2 + 10y + 4y2 = -2 + 2 + -10y + 10y

Combine like terms: -2 + 2 = 0
2 + 10y + 4y2 = 0 + -10y + 10y
2 + 10y + 4y2 = -10y + 10y

Combine like terms: -10y + 10y = 0
2 + 10y + 4y2 = 0

Factor out the Greatest Common Factor (GCF), '2'.
2(1 + 5y + 2y2) = 0

Ignore the factor 2.
Subproblem 1
Set the factor '(1 + 5y + 2y2)' equal to zero and attempt to solve:

Simplifying
1 + 5y + 2y2 = 0

Solving
1 + 5y + 2y2 = 0

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

Divide each side by '2'.
0.5 + 2.5y + y2 = 0

Move the constant term to the right:

Add '-0.5' to each side of the equation.
0.5 + 2.5y + -0.5 + y2 = 0 + -0.5

Reorder the terms:
0.5 + -0.5 + 2.5y + y2 = 0 + -0.5

Combine like terms: 0.5 + -0.5 = 0.0
0.0 + 2.5y + y2 = 0 + -0.5
2.5y + y2 = 0 + -0.5

Combine like terms: 0 + -0.5 = -0.5
2.5y + y2 = -0.5

The y term is 2.5y.  Take half its coefficient (1.25).
Square it (1.5625) and add it to both sides.

Add '1.5625' to each side of the equation.
2.5y + 1.5625 + y2 = -0.5 + 1.5625

Reorder the terms:
1.5625 + 2.5y + y2 = -0.5 + 1.5625

Combine like terms: -0.5 + 1.5625 = 1.0625
1.5625 + 2.5y + y2 = 1.0625

Factor a perfect square on the left side:
(y + 1.25)(y + 1.25) = 1.0625

Calculate the square root of the right side: 1.030776406

Break this problem into two subproblems by setting 
(y + 1.25) equal to 1.030776406 and -1.030776406.

Subproblem 1
y + 1.25 = 1.030776406

Simplifying
y + 1.25 = 1.030776406

Reorder the terms:
1.25 + y = 1.030776406

Solving
1.25 + y = 1.030776406

Solving for variable 'y'.

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

Add '-1.25' to each side of the equation.
1.25 + -1.25 + y = 1.030776406 + -1.25

Combine like terms: 1.25 + -1.25 = 0.00
0.00 + y = 1.030776406 + -1.25
y = 1.030776406 + -1.25

Combine like terms: 1.030776406 + -1.25 = -0.219223594
y = -0.219223594

Simplifying
y = -0.219223594

Subproblem 2
y + 1.25 = -1.030776406

Simplifying
y + 1.25 = -1.030776406

Reorder the terms:
1.25 + y = -1.030776406

Solving
1.25 + y = -1.030776406

Solving for variable 'y'.

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

Add '-1.25' to each side of the equation.
1.25 + -1.25 + y = -1.030776406 + -1.25

Combine like terms: 1.25 + -1.25 = 0.00
0.00 + y = -1.030776406 + -1.25
y = -1.030776406 + -1.25

Combine like terms: -1.030776406 + -1.25 = -2.280776406
y = -2.280776406

Simplifying
y = -2.280776406

Solution
The solution to the problem is based on the solutions
from the subproblems.
y = {-0.219223594, -2.280776406}
Solution
y = {-0.219223594, -2.280776406}