y-y^2-65=-125

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Solution for y-y^2-65=-125 equation:


Simplifying
y + -1y2 + -65 = -125

Reorder the terms:
-65 + y + -1y2 = -125

Solving
-65 + y + -1y2 = -125

Solving for variable 'y'.

Reorder the terms:
-65 + 125 + y + -1y2 = -125 + 125

Combine like terms: -65 + 125 = 60
60 + y + -1y2 = -125 + 125

Combine like terms: -125 + 125 = 0
60 + y + -1y2 = 0

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

Divide each side by '-1'.
-60 + -1y + y2 = 0

Move the constant term to the right:

Add '60' to each side of the equation.
-60 + -1y + 60 + y2 = 0 + 60

Reorder the terms:
-60 + 60 + -1y + y2 = 0 + 60

Combine like terms: -60 + 60 = 0
0 + -1y + y2 = 0 + 60
-1y + y2 = 0 + 60

Combine like terms: 0 + 60 = 60
-1y + y2 = 60

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.
-1y + 0.25 + y2 = 60 + 0.25

Reorder the terms:
0.25 + -1y + y2 = 60 + 0.25

Combine like terms: 60 + 0.25 = 60.25
0.25 + -1y + y2 = 60.25

Factor a perfect square on the left side:
(y + 0.5)(y + 0.5) = 60.25

Calculate the square root of the right side: 7.762087348

Break this problem into two subproblems by setting 
(y + 0.5) equal to 7.762087348 and -7.762087348.

Subproblem 1

y + 0.5 = 7.762087348 Simplifying y + 0.5 = 7.762087348 Reorder the terms: 0.5 + y = 7.762087348 Solving 0.5 + y = 7.762087348 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 = 7.762087348 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + y = 7.762087348 + -0.5 y = 7.762087348 + -0.5 Combine like terms: 7.762087348 + -0.5 = 7.262087348 y = 7.262087348 Simplifying y = 7.262087348

Subproblem 2

y + 0.5 = -7.762087348 Simplifying y + 0.5 = -7.762087348 Reorder the terms: 0.5 + y = -7.762087348 Solving 0.5 + y = -7.762087348 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 = -7.762087348 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + y = -7.762087348 + -0.5 y = -7.762087348 + -0.5 Combine like terms: -7.762087348 + -0.5 = -8.262087348 y = -8.262087348 Simplifying y = -8.262087348

Solution

The solution to the problem is based on the solutions from the subproblems. y = {7.262087348, -8.262087348}

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