2y^2+y=404

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Solution for 2y^2+y=404 equation:


Simplifying
2y2 + y = 404

Reorder the terms:
y + 2y2 = 404

Solving
y + 2y2 = 404

Solving for variable 'y'.

Reorder the terms:
-404 + y + 2y2 = 404 + -404

Combine like terms: 404 + -404 = 0
-404 + y + 2y2 = 0

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

Divide each side by '2'.
-202 + 0.5y + y2 = 0

Move the constant term to the right:

Add '202' to each side of the equation.
-202 + 0.5y + 202 + y2 = 0 + 202

Reorder the terms:
-202 + 202 + 0.5y + y2 = 0 + 202

Combine like terms: -202 + 202 = 0
0 + 0.5y + y2 = 0 + 202
0.5y + y2 = 0 + 202

Combine like terms: 0 + 202 = 202
0.5y + y2 = 202

The y term is y.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
0.5y + 0.25 + y2 = 202 + 0.25

Reorder the terms:
0.25 + 0.5y + y2 = 202 + 0.25

Combine like terms: 202 + 0.25 = 202.25
0.25 + 0.5y + y2 = 202.25

Factor a perfect square on the left side:
(y + 0.5)(y + 0.5) = 202.25

Calculate the square root of the right side: 14.221462653

Break this problem into two subproblems by setting 
(y + 0.5) equal to 14.221462653 and -14.221462653.

Subproblem 1

y + 0.5 = 14.221462653 Simplifying y + 0.5 = 14.221462653 Reorder the terms: 0.5 + y = 14.221462653 Solving 0.5 + y = 14.221462653 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + y = 14.221462653 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + y = 14.221462653 + -0.5 y = 14.221462653 + -0.5 Combine like terms: 14.221462653 + -0.5 = 13.721462653 y = 13.721462653 Simplifying y = 13.721462653

Subproblem 2

y + 0.5 = -14.221462653 Simplifying y + 0.5 = -14.221462653 Reorder the terms: 0.5 + y = -14.221462653 Solving 0.5 + y = -14.221462653 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + y = -14.221462653 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + y = -14.221462653 + -0.5 y = -14.221462653 + -0.5 Combine like terms: -14.221462653 + -0.5 = -14.721462653 y = -14.721462653 Simplifying y = -14.721462653

Solution

The solution to the problem is based on the solutions from the subproblems. y = {13.721462653, -14.721462653}

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