y^2+2y-199=0

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Solution for y^2+2y-199=0 equation:


Simplifying
y2 + 2y + -199 = 0

Reorder the terms:
-199 + 2y + y2 = 0

Solving
-199 + 2y + y2 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '199' to each side of the equation.
-199 + 2y + 199 + y2 = 0 + 199

Reorder the terms:
-199 + 199 + 2y + y2 = 0 + 199

Combine like terms: -199 + 199 = 0
0 + 2y + y2 = 0 + 199
2y + y2 = 0 + 199

Combine like terms: 0 + 199 = 199
2y + y2 = 199

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 = 199 + 1

Reorder the terms:
1 + 2y + y2 = 199 + 1

Combine like terms: 199 + 1 = 200
1 + 2y + y2 = 200

Factor a perfect square on the left side:
(y + 1)(y + 1) = 200

Calculate the square root of the right side: 14.142135624

Break this problem into two subproblems by setting 
(y + 1) equal to 14.142135624 and -14.142135624.

Subproblem 1

y + 1 = 14.142135624 Simplifying y + 1 = 14.142135624 Reorder the terms: 1 + y = 14.142135624 Solving 1 + y = 14.142135624 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 = 14.142135624 + -1 Combine like terms: 1 + -1 = 0 0 + y = 14.142135624 + -1 y = 14.142135624 + -1 Combine like terms: 14.142135624 + -1 = 13.142135624 y = 13.142135624 Simplifying y = 13.142135624

Subproblem 2

y + 1 = -14.142135624 Simplifying y + 1 = -14.142135624 Reorder the terms: 1 + y = -14.142135624 Solving 1 + y = -14.142135624 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 = -14.142135624 + -1 Combine like terms: 1 + -1 = 0 0 + y = -14.142135624 + -1 y = -14.142135624 + -1 Combine like terms: -14.142135624 + -1 = -15.142135624 y = -15.142135624 Simplifying y = -15.142135624

Solution

The solution to the problem is based on the solutions from the subproblems. y = {13.142135624, -15.142135624}

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