-4y^2+36y+1=0

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Solution for -4y^2+36y+1=0 equation:


Simplifying
-4y2 + 36y + 1 = 0

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

Solving
1 + 36y + -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'.
-0.25 + -9y + y2 = 0

Move the constant term to the right:

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

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

Combine like terms: -0.25 + 0.25 = 0.00
0.00 + -9y + y2 = 0 + 0.25
-9y + y2 = 0 + 0.25

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

The y term is -9y.  Take half its coefficient (-4.5).
Square it (20.25) and add it to both sides.

Add '20.25' to each side of the equation.
-9y + 20.25 + y2 = 0.25 + 20.25

Reorder the terms:
20.25 + -9y + y2 = 0.25 + 20.25

Combine like terms: 0.25 + 20.25 = 20.5
20.25 + -9y + y2 = 20.5

Factor a perfect square on the left side:
(y + -4.5)(y + -4.5) = 20.5

Calculate the square root of the right side: 4.527692569

Break this problem into two subproblems by setting 
(y + -4.5) equal to 4.527692569 and -4.527692569.

Subproblem 1

y + -4.5 = 4.527692569 Simplifying y + -4.5 = 4.527692569 Reorder the terms: -4.5 + y = 4.527692569 Solving -4.5 + y = 4.527692569 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '4.5' to each side of the equation. -4.5 + 4.5 + y = 4.527692569 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + y = 4.527692569 + 4.5 y = 4.527692569 + 4.5 Combine like terms: 4.527692569 + 4.5 = 9.027692569 y = 9.027692569 Simplifying y = 9.027692569

Subproblem 2

y + -4.5 = -4.527692569 Simplifying y + -4.5 = -4.527692569 Reorder the terms: -4.5 + y = -4.527692569 Solving -4.5 + y = -4.527692569 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '4.5' to each side of the equation. -4.5 + 4.5 + y = -4.527692569 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + y = -4.527692569 + 4.5 y = -4.527692569 + 4.5 Combine like terms: -4.527692569 + 4.5 = -0.027692569 y = -0.027692569 Simplifying y = -0.027692569

Solution

The solution to the problem is based on the solutions from the subproblems. y = {9.027692569, -0.027692569}

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