4y^2-9y-36=0

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Solution for 4y^2-9y-36=0 equation:


Simplifying
4y2 + -9y + -36 = 0

Reorder the terms:
-36 + -9y + 4y2 = 0

Solving
-36 + -9y + 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 + -2.25y + y2 = 0

Move the constant term to the right:

Add '9' to each side of the equation.
-9 + -2.25y + 9 + y2 = 0 + 9

Reorder the terms:
-9 + 9 + -2.25y + y2 = 0 + 9

Combine like terms: -9 + 9 = 0
0 + -2.25y + y2 = 0 + 9
-2.25y + y2 = 0 + 9

Combine like terms: 0 + 9 = 9
-2.25y + y2 = 9

The y term is -2.25y.  Take half its coefficient (-1.125).
Square it (1.265625) and add it to both sides.

Add '1.265625' to each side of the equation.
-2.25y + 1.265625 + y2 = 9 + 1.265625

Reorder the terms:
1.265625 + -2.25y + y2 = 9 + 1.265625

Combine like terms: 9 + 1.265625 = 10.265625
1.265625 + -2.25y + y2 = 10.265625

Factor a perfect square on the left side:
(y + -1.125)(y + -1.125) = 10.265625

Calculate the square root of the right side: 3.204001404

Break this problem into two subproblems by setting 
(y + -1.125) equal to 3.204001404 and -3.204001404.

Subproblem 1

y + -1.125 = 3.204001404 Simplifying y + -1.125 = 3.204001404 Reorder the terms: -1.125 + y = 3.204001404 Solving -1.125 + y = 3.204001404 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1.125' to each side of the equation. -1.125 + 1.125 + y = 3.204001404 + 1.125 Combine like terms: -1.125 + 1.125 = 0.000 0.000 + y = 3.204001404 + 1.125 y = 3.204001404 + 1.125 Combine like terms: 3.204001404 + 1.125 = 4.329001404 y = 4.329001404 Simplifying y = 4.329001404

Subproblem 2

y + -1.125 = -3.204001404 Simplifying y + -1.125 = -3.204001404 Reorder the terms: -1.125 + y = -3.204001404 Solving -1.125 + y = -3.204001404 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1.125' to each side of the equation. -1.125 + 1.125 + y = -3.204001404 + 1.125 Combine like terms: -1.125 + 1.125 = 0.000 0.000 + y = -3.204001404 + 1.125 y = -3.204001404 + 1.125 Combine like terms: -3.204001404 + 1.125 = -2.079001404 y = -2.079001404 Simplifying y = -2.079001404

Solution

The solution to the problem is based on the solutions from the subproblems. y = {4.329001404, -2.079001404}

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