y^2+8y-196=0

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Solution for y^2+8y-196=0 equation:


Simplifying
y2 + 8y + -196 = 0

Reorder the terms:
-196 + 8y + y2 = 0

Solving
-196 + 8y + y2 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '196' to each side of the equation.
-196 + 8y + 196 + y2 = 0 + 196

Reorder the terms:
-196 + 196 + 8y + y2 = 0 + 196

Combine like terms: -196 + 196 = 0
0 + 8y + y2 = 0 + 196
8y + y2 = 0 + 196

Combine like terms: 0 + 196 = 196
8y + y2 = 196

The y term is 8y.  Take half its coefficient (4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
8y + 16 + y2 = 196 + 16

Reorder the terms:
16 + 8y + y2 = 196 + 16

Combine like terms: 196 + 16 = 212
16 + 8y + y2 = 212

Factor a perfect square on the left side:
(y + 4)(y + 4) = 212

Calculate the square root of the right side: 14.560219779

Break this problem into two subproblems by setting 
(y + 4) equal to 14.560219779 and -14.560219779.

Subproblem 1

y + 4 = 14.560219779 Simplifying y + 4 = 14.560219779 Reorder the terms: 4 + y = 14.560219779 Solving 4 + y = 14.560219779 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + y = 14.560219779 + -4 Combine like terms: 4 + -4 = 0 0 + y = 14.560219779 + -4 y = 14.560219779 + -4 Combine like terms: 14.560219779 + -4 = 10.560219779 y = 10.560219779 Simplifying y = 10.560219779

Subproblem 2

y + 4 = -14.560219779 Simplifying y + 4 = -14.560219779 Reorder the terms: 4 + y = -14.560219779 Solving 4 + y = -14.560219779 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + y = -14.560219779 + -4 Combine like terms: 4 + -4 = 0 0 + y = -14.560219779 + -4 y = -14.560219779 + -4 Combine like terms: -14.560219779 + -4 = -18.560219779 y = -18.560219779 Simplifying y = -18.560219779

Solution

The solution to the problem is based on the solutions from the subproblems. y = {10.560219779, -18.560219779}

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