y^2+4y-198=0

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Solution for y^2+4y-198=0 equation:


Simplifying
y2 + 4y + -198 = 0

Reorder the terms:
-198 + 4y + y2 = 0

Solving
-198 + 4y + y2 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '198' to each side of the equation.
-198 + 4y + 198 + y2 = 0 + 198

Reorder the terms:
-198 + 198 + 4y + y2 = 0 + 198

Combine like terms: -198 + 198 = 0
0 + 4y + y2 = 0 + 198
4y + y2 = 0 + 198

Combine like terms: 0 + 198 = 198
4y + y2 = 198

The y term is 4y.  Take half its coefficient (2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
4y + 4 + y2 = 198 + 4

Reorder the terms:
4 + 4y + y2 = 198 + 4

Combine like terms: 198 + 4 = 202
4 + 4y + y2 = 202

Factor a perfect square on the left side:
(y + 2)(y + 2) = 202

Calculate the square root of the right side: 14.212670404

Break this problem into two subproblems by setting 
(y + 2) equal to 14.212670404 and -14.212670404.

Subproblem 1

y + 2 = 14.212670404 Simplifying y + 2 = 14.212670404 Reorder the terms: 2 + y = 14.212670404 Solving 2 + y = 14.212670404 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + y = 14.212670404 + -2 Combine like terms: 2 + -2 = 0 0 + y = 14.212670404 + -2 y = 14.212670404 + -2 Combine like terms: 14.212670404 + -2 = 12.212670404 y = 12.212670404 Simplifying y = 12.212670404

Subproblem 2

y + 2 = -14.212670404 Simplifying y + 2 = -14.212670404 Reorder the terms: 2 + y = -14.212670404 Solving 2 + y = -14.212670404 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + y = -14.212670404 + -2 Combine like terms: 2 + -2 = 0 0 + y = -14.212670404 + -2 y = -14.212670404 + -2 Combine like terms: -14.212670404 + -2 = -16.212670404 y = -16.212670404 Simplifying y = -16.212670404

Solution

The solution to the problem is based on the solutions from the subproblems. y = {12.212670404, -16.212670404}

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