-5y^2+2y+2=0

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


Simplifying
-5y2 + 2y + 2 = 0

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

Solving
2 + 2y + -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 + -0.4y + y2 = 0

Move the constant term to the right:

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

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

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

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

The y term is -0.4y.  Take half its coefficient (-0.2).
Square it (0.04) and add it to both sides.

Add '0.04' to each side of the equation.
-0.4y + 0.04 + y2 = 0.4 + 0.04

Reorder the terms:
0.04 + -0.4y + y2 = 0.4 + 0.04

Combine like terms: 0.4 + 0.04 = 0.44
0.04 + -0.4y + y2 = 0.44

Factor a perfect square on the left side:
(y + -0.2)(y + -0.2) = 0.44

Calculate the square root of the right side: 0.663324958

Break this problem into two subproblems by setting 
(y + -0.2) equal to 0.663324958 and -0.663324958.

Subproblem 1

y + -0.2 = 0.663324958 Simplifying y + -0.2 = 0.663324958 Reorder the terms: -0.2 + y = 0.663324958 Solving -0.2 + y = 0.663324958 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.2' to each side of the equation. -0.2 + 0.2 + y = 0.663324958 + 0.2 Combine like terms: -0.2 + 0.2 = 0.0 0.0 + y = 0.663324958 + 0.2 y = 0.663324958 + 0.2 Combine like terms: 0.663324958 + 0.2 = 0.863324958 y = 0.863324958 Simplifying y = 0.863324958

Subproblem 2

y + -0.2 = -0.663324958 Simplifying y + -0.2 = -0.663324958 Reorder the terms: -0.2 + y = -0.663324958 Solving -0.2 + y = -0.663324958 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.2' to each side of the equation. -0.2 + 0.2 + y = -0.663324958 + 0.2 Combine like terms: -0.2 + 0.2 = 0.0 0.0 + y = -0.663324958 + 0.2 y = -0.663324958 + 0.2 Combine like terms: -0.663324958 + 0.2 = -0.463324958 y = -0.463324958 Simplifying y = -0.463324958

Solution

The solution to the problem is based on the solutions from the subproblems. y = {0.863324958, -0.463324958}

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