100=y^2+2y-96

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Solution for 100=y^2+2y-96 equation:


Simplifying
100 = y2 + 2y + -96

Reorder the terms:
100 = -96 + 2y + y2

Solving
100 = -96 + 2y + y2

Solving for variable 'y'.

Combine like terms: 100 + 96 = 196
196 + -2y + -1y2 = -96 + 2y + y2 + 96 + -2y + -1y2

Reorder the terms:
196 + -2y + -1y2 = -96 + 96 + 2y + -2y + y2 + -1y2

Combine like terms: -96 + 96 = 0
196 + -2y + -1y2 = 0 + 2y + -2y + y2 + -1y2
196 + -2y + -1y2 = 2y + -2y + y2 + -1y2

Combine like terms: 2y + -2y = 0
196 + -2y + -1y2 = 0 + y2 + -1y2
196 + -2y + -1y2 = y2 + -1y2

Combine like terms: y2 + -1y2 = 0
196 + -2y + -1y2 = 0

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

Divide each side by '-1'.
-196 + 2y + y2 = 0

Move the constant term to the right:

Add '196' to each side of the equation.
-196 + 2y + 196 + y2 = 0 + 196

Reorder the terms:
-196 + 196 + 2y + y2 = 0 + 196

Combine like terms: -196 + 196 = 0
0 + 2y + y2 = 0 + 196
2y + y2 = 0 + 196

Combine like terms: 0 + 196 = 196
2y + y2 = 196

The y term is 2y.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2y + 1 + y2 = 196 + 1

Reorder the terms:
1 + 2y + y2 = 196 + 1

Combine like terms: 196 + 1 = 197
1 + 2y + y2 = 197

Factor a perfect square on the left side:
(y + 1)(y + 1) = 197

Calculate the square root of the right side: 14.035668848

Break this problem into two subproblems by setting 
(y + 1) equal to 14.035668848 and -14.035668848.

Subproblem 1

y + 1 = 14.035668848 Simplifying y + 1 = 14.035668848 Reorder the terms: 1 + y = 14.035668848 Solving 1 + y = 14.035668848 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + y = 14.035668848 + -1 Combine like terms: 1 + -1 = 0 0 + y = 14.035668848 + -1 y = 14.035668848 + -1 Combine like terms: 14.035668848 + -1 = 13.035668848 y = 13.035668848 Simplifying y = 13.035668848

Subproblem 2

y + 1 = -14.035668848 Simplifying y + 1 = -14.035668848 Reorder the terms: 1 + y = -14.035668848 Solving 1 + y = -14.035668848 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + y = -14.035668848 + -1 Combine like terms: 1 + -1 = 0 0 + y = -14.035668848 + -1 y = -14.035668848 + -1 Combine like terms: -14.035668848 + -1 = -15.035668848 y = -15.035668848 Simplifying y = -15.035668848

Solution

The solution to the problem is based on the solutions from the subproblems. y = {13.035668848, -15.035668848}

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