5y^2+11y+4=0

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Solution for 5y^2+11y+4=0 equation:


Simplifying
5y2 + 11y + 4 = 0

Reorder the terms:
4 + 11y + 5y2 = 0

Solving
4 + 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'.
0.8 + 2.2y + y2 = 0

Move the constant term to the right:

Add '-0.8' to each side of the equation.
0.8 + 2.2y + -0.8 + y2 = 0 + -0.8

Reorder the terms:
0.8 + -0.8 + 2.2y + y2 = 0 + -0.8

Combine like terms: 0.8 + -0.8 = 0.0
0.0 + 2.2y + y2 = 0 + -0.8
2.2y + y2 = 0 + -0.8

Combine like terms: 0 + -0.8 = -0.8
2.2y + y2 = -0.8

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 = -0.8 + 1.21

Reorder the terms:
1.21 + 2.2y + y2 = -0.8 + 1.21

Combine like terms: -0.8 + 1.21 = 0.41
1.21 + 2.2y + y2 = 0.41

Factor a perfect square on the left side:
(y + 1.1)(y + 1.1) = 0.41

Calculate the square root of the right side: 0.640312424

Break this problem into two subproblems by setting 
(y + 1.1) equal to 0.640312424 and -0.640312424.

Subproblem 1

y + 1.1 = 0.640312424 Simplifying y + 1.1 = 0.640312424 Reorder the terms: 1.1 + y = 0.640312424 Solving 1.1 + y = 0.640312424 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 = 0.640312424 + -1.1 Combine like terms: 1.1 + -1.1 = 0.0 0.0 + y = 0.640312424 + -1.1 y = 0.640312424 + -1.1 Combine like terms: 0.640312424 + -1.1 = -0.459687576 y = -0.459687576 Simplifying y = -0.459687576

Subproblem 2

y + 1.1 = -0.640312424 Simplifying y + 1.1 = -0.640312424 Reorder the terms: 1.1 + y = -0.640312424 Solving 1.1 + y = -0.640312424 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 = -0.640312424 + -1.1 Combine like terms: 1.1 + -1.1 = 0.0 0.0 + y = -0.640312424 + -1.1 y = -0.640312424 + -1.1 Combine like terms: -0.640312424 + -1.1 = -1.740312424 y = -1.740312424 Simplifying y = -1.740312424

Solution

The solution to the problem is based on the solutions from the subproblems. y = {-0.459687576, -1.740312424}

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