100-20y=y^2

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Solution for 100-20y=y^2 equation:


Simplifying
100 + -20y = y2

Solving
100 + -20y = y2

Solving for variable 'y'.

Combine like terms: y2 + -1y2 = 0
100 + -20y + -1y2 = 0

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

Divide each side by '-1'.
-100 + 20y + y2 = 0

Move the constant term to the right:

Add '100' to each side of the equation.
-100 + 20y + 100 + y2 = 0 + 100

Reorder the terms:
-100 + 100 + 20y + y2 = 0 + 100

Combine like terms: -100 + 100 = 0
0 + 20y + y2 = 0 + 100
20y + y2 = 0 + 100

Combine like terms: 0 + 100 = 100
20y + y2 = 100

The y term is 20y.  Take half its coefficient (10).
Square it (100) and add it to both sides.

Add '100' to each side of the equation.
20y + 100 + y2 = 100 + 100

Reorder the terms:
100 + 20y + y2 = 100 + 100

Combine like terms: 100 + 100 = 200
100 + 20y + y2 = 200

Factor a perfect square on the left side:
(y + 10)(y + 10) = 200

Calculate the square root of the right side: 14.142135624

Break this problem into two subproblems by setting 
(y + 10) equal to 14.142135624 and -14.142135624.

Subproblem 1

y + 10 = 14.142135624 Simplifying y + 10 = 14.142135624 Reorder the terms: 10 + y = 14.142135624 Solving 10 + y = 14.142135624 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + y = 14.142135624 + -10 Combine like terms: 10 + -10 = 0 0 + y = 14.142135624 + -10 y = 14.142135624 + -10 Combine like terms: 14.142135624 + -10 = 4.142135624 y = 4.142135624 Simplifying y = 4.142135624

Subproblem 2

y + 10 = -14.142135624 Simplifying y + 10 = -14.142135624 Reorder the terms: 10 + y = -14.142135624 Solving 10 + y = -14.142135624 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + y = -14.142135624 + -10 Combine like terms: 10 + -10 = 0 0 + y = -14.142135624 + -10 y = -14.142135624 + -10 Combine like terms: -14.142135624 + -10 = -24.142135624 y = -24.142135624 Simplifying y = -24.142135624

Solution

The solution to the problem is based on the solutions from the subproblems. y = {4.142135624, -24.142135624}

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