0=y^2-3y-36

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Solution for 0=y^2-3y-36 equation:


Simplifying
0 = y2 + -3y + -36

Reorder the terms:
0 = -36 + -3y + y2

Solving
0 = -36 + -3y + y2

Solving for variable 'y'.

Combine like terms: 0 + 36 = 36
36 + 3y + -1y2 = -36 + -3y + y2 + 36 + 3y + -1y2

Reorder the terms:
36 + 3y + -1y2 = -36 + 36 + -3y + 3y + y2 + -1y2

Combine like terms: -36 + 36 = 0
36 + 3y + -1y2 = 0 + -3y + 3y + y2 + -1y2
36 + 3y + -1y2 = -3y + 3y + y2 + -1y2

Combine like terms: -3y + 3y = 0
36 + 3y + -1y2 = 0 + y2 + -1y2
36 + 3y + -1y2 = y2 + -1y2

Combine like terms: y2 + -1y2 = 0
36 + 3y + -1y2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-36 + -3y + y2 = 0

Move the constant term to the right:

Add '36' to each side of the equation.
-36 + -3y + 36 + y2 = 0 + 36

Reorder the terms:
-36 + 36 + -3y + y2 = 0 + 36

Combine like terms: -36 + 36 = 0
0 + -3y + y2 = 0 + 36
-3y + y2 = 0 + 36

Combine like terms: 0 + 36 = 36
-3y + y2 = 36

The y term is -3y.  Take half its coefficient (-1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
-3y + 2.25 + y2 = 36 + 2.25

Reorder the terms:
2.25 + -3y + y2 = 36 + 2.25

Combine like terms: 36 + 2.25 = 38.25
2.25 + -3y + y2 = 38.25

Factor a perfect square on the left side:
(y + -1.5)(y + -1.5) = 38.25

Calculate the square root of the right side: 6.184658438

Break this problem into two subproblems by setting 
(y + -1.5) equal to 6.184658438 and -6.184658438.

Subproblem 1

y + -1.5 = 6.184658438 Simplifying y + -1.5 = 6.184658438 Reorder the terms: -1.5 + y = 6.184658438 Solving -1.5 + y = 6.184658438 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + y = 6.184658438 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + y = 6.184658438 + 1.5 y = 6.184658438 + 1.5 Combine like terms: 6.184658438 + 1.5 = 7.684658438 y = 7.684658438 Simplifying y = 7.684658438

Subproblem 2

y + -1.5 = -6.184658438 Simplifying y + -1.5 = -6.184658438 Reorder the terms: -1.5 + y = -6.184658438 Solving -1.5 + y = -6.184658438 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + y = -6.184658438 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + y = -6.184658438 + 1.5 y = -6.184658438 + 1.5 Combine like terms: -6.184658438 + 1.5 = -4.684658438 y = -4.684658438 Simplifying y = -4.684658438

Solution

The solution to the problem is based on the solutions from the subproblems. y = {7.684658438, -4.684658438}

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