y^2+y=36

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Solution for y^2+y=36 equation:


Simplifying
y2 + y = 36

Reorder the terms:
y + y2 = 36

Solving
y + y2 = 36

Solving for variable 'y'.

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

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

Begin completing the square.

Move the constant term to the right:

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

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

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

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

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.
y + 0.25 + y2 = 36 + 0.25

Reorder the terms:
0.25 + y + y2 = 36 + 0.25

Combine like terms: 36 + 0.25 = 36.25
0.25 + y + y2 = 36.25

Factor a perfect square on the left side:
(y + 0.5)(y + 0.5) = 36.25

Calculate the square root of the right side: 6.020797289

Break this problem into two subproblems by setting 
(y + 0.5) equal to 6.020797289 and -6.020797289.

Subproblem 1

y + 0.5 = 6.020797289 Simplifying y + 0.5 = 6.020797289 Reorder the terms: 0.5 + y = 6.020797289 Solving 0.5 + y = 6.020797289 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 = 6.020797289 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + y = 6.020797289 + -0.5 y = 6.020797289 + -0.5 Combine like terms: 6.020797289 + -0.5 = 5.520797289 y = 5.520797289 Simplifying y = 5.520797289

Subproblem 2

y + 0.5 = -6.020797289 Simplifying y + 0.5 = -6.020797289 Reorder the terms: 0.5 + y = -6.020797289 Solving 0.5 + y = -6.020797289 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 = -6.020797289 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + y = -6.020797289 + -0.5 y = -6.020797289 + -0.5 Combine like terms: -6.020797289 + -0.5 = -6.520797289 y = -6.520797289 Simplifying y = -6.520797289

Solution

The solution to the problem is based on the solutions from the subproblems. y = {5.520797289, -6.520797289}

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