-5y^2+11y+2=0

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Solution for -5y^2+11y+2=0 equation:


Simplifying
-5y2 + 11y + 2 = 0

Reorder the terms:
2 + 11y + -5y2 = 0

Solving
2 + 11y + -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 + -2.2y + y2 = 0

Move the constant term to the right:

Add '0.4' to each side of the equation.
-0.4 + -2.2y + 0.4 + y2 = 0 + 0.4

Reorder the terms:
-0.4 + 0.4 + -2.2y + y2 = 0 + 0.4

Combine like terms: -0.4 + 0.4 = 0.0
0.0 + -2.2y + y2 = 0 + 0.4
-2.2y + y2 = 0 + 0.4

Combine like terms: 0 + 0.4 = 0.4
-2.2y + y2 = 0.4

The y term is -2.2y.  Take half its coefficient (-1.1).
Square it (1.21) and add it to both sides.

Add '1.21' to each side of the equation.
-2.2y + 1.21 + y2 = 0.4 + 1.21

Reorder the terms:
1.21 + -2.2y + y2 = 0.4 + 1.21

Combine like terms: 0.4 + 1.21 = 1.61
1.21 + -2.2y + y2 = 1.61

Factor a perfect square on the left side:
(y + -1.1)(y + -1.1) = 1.61

Calculate the square root of the right side: 1.268857754

Break this problem into two subproblems by setting 
(y + -1.1) equal to 1.268857754 and -1.268857754.

Subproblem 1

y + -1.1 = 1.268857754 Simplifying y + -1.1 = 1.268857754 Reorder the terms: -1.1 + y = 1.268857754 Solving -1.1 + y = 1.268857754 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1.1' to each side of the equation. -1.1 + 1.1 + y = 1.268857754 + 1.1 Combine like terms: -1.1 + 1.1 = 0.0 0.0 + y = 1.268857754 + 1.1 y = 1.268857754 + 1.1 Combine like terms: 1.268857754 + 1.1 = 2.368857754 y = 2.368857754 Simplifying y = 2.368857754

Subproblem 2

y + -1.1 = -1.268857754 Simplifying y + -1.1 = -1.268857754 Reorder the terms: -1.1 + y = -1.268857754 Solving -1.1 + y = -1.268857754 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1.1' to each side of the equation. -1.1 + 1.1 + y = -1.268857754 + 1.1 Combine like terms: -1.1 + 1.1 = 0.0 0.0 + y = -1.268857754 + 1.1 y = -1.268857754 + 1.1 Combine like terms: -1.268857754 + 1.1 = -0.168857754 y = -0.168857754 Simplifying y = -0.168857754

Solution

The solution to the problem is based on the solutions from the subproblems. y = {2.368857754, -0.168857754}

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