100-100y=-y^2

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Solution for 100-100y=-y^2 equation:


Simplifying
100 + -100y = -1y2

Solving
100 + -100y = -1y2

Solving for variable 'y'.

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

Begin completing the square.

Move the constant term to the right:

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

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

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

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

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 = -100 + 2500

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

Combine like terms: -100 + 2500 = 2400
2500 + -100y + y2 = 2400

Factor a perfect square on the left side:
(y + -50)(y + -50) = 2400

Calculate the square root of the right side: 48.989794856

Break this problem into two subproblems by setting 
(y + -50) equal to 48.989794856 and -48.989794856.

Subproblem 1

y + -50 = 48.989794856 Simplifying y + -50 = 48.989794856 Reorder the terms: -50 + y = 48.989794856 Solving -50 + y = 48.989794856 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 = 48.989794856 + 50 Combine like terms: -50 + 50 = 0 0 + y = 48.989794856 + 50 y = 48.989794856 + 50 Combine like terms: 48.989794856 + 50 = 98.989794856 y = 98.989794856 Simplifying y = 98.989794856

Subproblem 2

y + -50 = -48.989794856 Simplifying y + -50 = -48.989794856 Reorder the terms: -50 + y = -48.989794856 Solving -50 + y = -48.989794856 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 = -48.989794856 + 50 Combine like terms: -50 + 50 = 0 0 + y = -48.989794856 + 50 y = -48.989794856 + 50 Combine like terms: -48.989794856 + 50 = 1.010205144 y = 1.010205144 Simplifying y = 1.010205144

Solution

The solution to the problem is based on the solutions from the subproblems. y = {98.989794856, 1.010205144}

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