4y^2-y-36=0

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Solution for 4y^2-y-36=0 equation:


Simplifying
4y2 + -1y + -36 = 0

Reorder the terms:
-36 + -1y + 4y2 = 0

Solving
-36 + -1y + 4y2 = 0

Solving for variable 'y'.

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

Divide each side by '4'.
-9 + -0.25y + y2 = 0

Move the constant term to the right:

Add '9' to each side of the equation.
-9 + -0.25y + 9 + y2 = 0 + 9

Reorder the terms:
-9 + 9 + -0.25y + y2 = 0 + 9

Combine like terms: -9 + 9 = 0
0 + -0.25y + y2 = 0 + 9
-0.25y + y2 = 0 + 9

Combine like terms: 0 + 9 = 9
-0.25y + y2 = 9

The y term is -0.25y.  Take half its coefficient (-0.125).
Square it (0.015625) and add it to both sides.

Add '0.015625' to each side of the equation.
-0.25y + 0.015625 + y2 = 9 + 0.015625

Reorder the terms:
0.015625 + -0.25y + y2 = 9 + 0.015625

Combine like terms: 9 + 0.015625 = 9.015625
0.015625 + -0.25y + y2 = 9.015625

Factor a perfect square on the left side:
(y + -0.125)(y + -0.125) = 9.015625

Calculate the square root of the right side: 3.002603037

Break this problem into two subproblems by setting 
(y + -0.125) equal to 3.002603037 and -3.002603037.

Subproblem 1

y + -0.125 = 3.002603037 Simplifying y + -0.125 = 3.002603037 Reorder the terms: -0.125 + y = 3.002603037 Solving -0.125 + y = 3.002603037 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.125' to each side of the equation. -0.125 + 0.125 + y = 3.002603037 + 0.125 Combine like terms: -0.125 + 0.125 = 0.000 0.000 + y = 3.002603037 + 0.125 y = 3.002603037 + 0.125 Combine like terms: 3.002603037 + 0.125 = 3.127603037 y = 3.127603037 Simplifying y = 3.127603037

Subproblem 2

y + -0.125 = -3.002603037 Simplifying y + -0.125 = -3.002603037 Reorder the terms: -0.125 + y = -3.002603037 Solving -0.125 + y = -3.002603037 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.125' to each side of the equation. -0.125 + 0.125 + y = -3.002603037 + 0.125 Combine like terms: -0.125 + 0.125 = 0.000 0.000 + y = -3.002603037 + 0.125 y = -3.002603037 + 0.125 Combine like terms: -3.002603037 + 0.125 = -2.877603037 y = -2.877603037 Simplifying y = -2.877603037

Solution

The solution to the problem is based on the solutions from the subproblems. y = {3.127603037, -2.877603037}

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