5y^2+8y+2=0

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Solution for 5y^2+8y+2=0 equation:


Simplifying
5y2 + 8y + 2 = 0

Reorder the terms:
2 + 8y + 5y2 = 0

Solving
2 + 8y + 5y2 = 0

Solving for variable 'y'.

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

Divide each side by '5'.
0.4 + 1.6y + y2 = 0

Move the constant term to the right:

Add '-0.4' to each side of the equation.
0.4 + 1.6y + -0.4 + y2 = 0 + -0.4

Reorder the terms:
0.4 + -0.4 + 1.6y + y2 = 0 + -0.4

Combine like terms: 0.4 + -0.4 = 0.0
0.0 + 1.6y + y2 = 0 + -0.4
1.6y + y2 = 0 + -0.4

Combine like terms: 0 + -0.4 = -0.4
1.6y + y2 = -0.4

The y term is 1.6y.  Take half its coefficient (0.8).
Square it (0.64) and add it to both sides.

Add '0.64' to each side of the equation.
1.6y + 0.64 + y2 = -0.4 + 0.64

Reorder the terms:
0.64 + 1.6y + y2 = -0.4 + 0.64

Combine like terms: -0.4 + 0.64 = 0.24
0.64 + 1.6y + y2 = 0.24

Factor a perfect square on the left side:
(y + 0.8)(y + 0.8) = 0.24

Calculate the square root of the right side: 0.489897949

Break this problem into two subproblems by setting 
(y + 0.8) equal to 0.489897949 and -0.489897949.

Subproblem 1

y + 0.8 = 0.489897949 Simplifying y + 0.8 = 0.489897949 Reorder the terms: 0.8 + y = 0.489897949 Solving 0.8 + y = 0.489897949 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.8' to each side of the equation. 0.8 + -0.8 + y = 0.489897949 + -0.8 Combine like terms: 0.8 + -0.8 = 0.0 0.0 + y = 0.489897949 + -0.8 y = 0.489897949 + -0.8 Combine like terms: 0.489897949 + -0.8 = -0.310102051 y = -0.310102051 Simplifying y = -0.310102051

Subproblem 2

y + 0.8 = -0.489897949 Simplifying y + 0.8 = -0.489897949 Reorder the terms: 0.8 + y = -0.489897949 Solving 0.8 + y = -0.489897949 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.8' to each side of the equation. 0.8 + -0.8 + y = -0.489897949 + -0.8 Combine like terms: 0.8 + -0.8 = 0.0 0.0 + y = -0.489897949 + -0.8 y = -0.489897949 + -0.8 Combine like terms: -0.489897949 + -0.8 = -1.289897949 y = -1.289897949 Simplifying y = -1.289897949

Solution

The solution to the problem is based on the solutions from the subproblems. y = {-0.310102051, -1.289897949}

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