y=85+.5y(-40+.25y)+90+61

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Solution for y=85+.5y(-40+.25y)+90+61 equation:


Simplifying
y = 85 + 0.5y(-40 + 0.25y) + 90 + 61
y = 85 + (-40 * 0.5y + 0.25y * 0.5y) + 90 + 61
y = 85 + (-20y + 0.125y2) + 90 + 61

Reorder the terms:
y = 85 + 90 + 61 + -20y + 0.125y2

Combine like terms: 85 + 90 = 175
y = 175 + 61 + -20y + 0.125y2

Combine like terms: 175 + 61 = 236
y = 236 + -20y + 0.125y2

Solving
y = 236 + -20y + 0.125y2

Solving for variable 'y'.

Reorder the terms:
-236 + y + 20y + -0.125y2 = 236 + -20y + 0.125y2 + -236 + 20y + -0.125y2

Combine like terms: y + 20y = 21y
-236 + 21y + -0.125y2 = 236 + -20y + 0.125y2 + -236 + 20y + -0.125y2

Reorder the terms:
-236 + 21y + -0.125y2 = 236 + -236 + -20y + 20y + 0.125y2 + -0.125y2

Combine like terms: 236 + -236 = 0
-236 + 21y + -0.125y2 = 0 + -20y + 20y + 0.125y2 + -0.125y2
-236 + 21y + -0.125y2 = -20y + 20y + 0.125y2 + -0.125y2

Combine like terms: -20y + 20y = 0
-236 + 21y + -0.125y2 = 0 + 0.125y2 + -0.125y2
-236 + 21y + -0.125y2 = 0.125y2 + -0.125y2

Combine like terms: 0.125y2 + -0.125y2 = 0.000
-236 + 21y + -0.125y2 = 0.000

Begin completing the square.  Divide all terms by
-0.125 the coefficient of the squared term: 

Divide each side by '-0.125'.
1888 + -168y + y2 = 0

Move the constant term to the right:

Add '-1888' to each side of the equation.
1888 + -168y + -1888 + y2 = 0 + -1888

Reorder the terms:
1888 + -1888 + -168y + y2 = 0 + -1888

Combine like terms: 1888 + -1888 = 0
0 + -168y + y2 = 0 + -1888
-168y + y2 = 0 + -1888

Combine like terms: 0 + -1888 = -1888
-168y + y2 = -1888

The y term is -168y.  Take half its coefficient (-84).
Square it (7056) and add it to both sides.

Add '7056' to each side of the equation.
-168y + 7056 + y2 = -1888 + 7056

Reorder the terms:
7056 + -168y + y2 = -1888 + 7056

Combine like terms: -1888 + 7056 = 5168
7056 + -168y + y2 = 5168

Factor a perfect square on the left side:
(y + -84)(y + -84) = 5168

Calculate the square root of the right side: 71.888803022

Break this problem into two subproblems by setting 
(y + -84) equal to 71.888803022 and -71.888803022.

Subproblem 1

y + -84 = 71.888803022 Simplifying y + -84 = 71.888803022 Reorder the terms: -84 + y = 71.888803022 Solving -84 + y = 71.888803022 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '84' to each side of the equation. -84 + 84 + y = 71.888803022 + 84 Combine like terms: -84 + 84 = 0 0 + y = 71.888803022 + 84 y = 71.888803022 + 84 Combine like terms: 71.888803022 + 84 = 155.888803022 y = 155.888803022 Simplifying y = 155.888803022

Subproblem 2

y + -84 = -71.888803022 Simplifying y + -84 = -71.888803022 Reorder the terms: -84 + y = -71.888803022 Solving -84 + y = -71.888803022 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '84' to each side of the equation. -84 + 84 + y = -71.888803022 + 84 Combine like terms: -84 + 84 = 0 0 + y = -71.888803022 + 84 y = -71.888803022 + 84 Combine like terms: -71.888803022 + 84 = 12.111196978 y = 12.111196978 Simplifying y = 12.111196978

Solution

The solution to the problem is based on the solutions from the subproblems. y = {155.888803022, 12.111196978}

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