0=-y^2+100y+10000

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Solution for 0=-y^2+100y+10000 equation:


Simplifying
0 = -1y2 + 100y + 10000

Reorder the terms:
0 = 10000 + 100y + -1y2

Solving
0 = 10000 + 100y + -1y2

Solving for variable 'y'.

Combine like terms: 0 + -10000 = -10000
-10000 + -100y + y2 = 10000 + 100y + -1y2 + -10000 + -100y + y2

Reorder the terms:
-10000 + -100y + y2 = 10000 + -10000 + 100y + -100y + -1y2 + y2

Combine like terms: 10000 + -10000 = 0
-10000 + -100y + y2 = 0 + 100y + -100y + -1y2 + y2
-10000 + -100y + y2 = 100y + -100y + -1y2 + y2

Combine like terms: 100y + -100y = 0
-10000 + -100y + y2 = 0 + -1y2 + y2
-10000 + -100y + y2 = -1y2 + y2

Combine like terms: -1y2 + y2 = 0
-10000 + -100y + y2 = 0

Begin completing the square.

Move the constant term to the right:

Add '10000' to each side of the equation.
-10000 + -100y + 10000 + y2 = 0 + 10000

Reorder the terms:
-10000 + 10000 + -100y + y2 = 0 + 10000

Combine like terms: -10000 + 10000 = 0
0 + -100y + y2 = 0 + 10000
-100y + y2 = 0 + 10000

Combine like terms: 0 + 10000 = 10000
-100y + y2 = 10000

The y term is -100y.  Take half its coefficient (-50).
Square it (2500) and add it to both sides.

Add '2500' to each side of the equation.
-100y + 2500 + y2 = 10000 + 2500

Reorder the terms:
2500 + -100y + y2 = 10000 + 2500

Combine like terms: 10000 + 2500 = 12500
2500 + -100y + y2 = 12500

Factor a perfect square on the left side:
(y + -50)(y + -50) = 12500

Calculate the square root of the right side: 111.803398875

Break this problem into two subproblems by setting 
(y + -50) equal to 111.803398875 and -111.803398875.

Subproblem 1

y + -50 = 111.803398875 Simplifying y + -50 = 111.803398875 Reorder the terms: -50 + y = 111.803398875 Solving -50 + y = 111.803398875 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '50' to each side of the equation. -50 + 50 + y = 111.803398875 + 50 Combine like terms: -50 + 50 = 0 0 + y = 111.803398875 + 50 y = 111.803398875 + 50 Combine like terms: 111.803398875 + 50 = 161.803398875 y = 161.803398875 Simplifying y = 161.803398875

Subproblem 2

y + -50 = -111.803398875 Simplifying y + -50 = -111.803398875 Reorder the terms: -50 + y = -111.803398875 Solving -50 + y = -111.803398875 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '50' to each side of the equation. -50 + 50 + y = -111.803398875 + 50 Combine like terms: -50 + 50 = 0 0 + y = -111.803398875 + 50 y = -111.803398875 + 50 Combine like terms: -111.803398875 + 50 = -61.803398875 y = -61.803398875 Simplifying y = -61.803398875

Solution

The solution to the problem is based on the solutions from the subproblems. y = {161.803398875, -61.803398875}

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