y^2+28y-132=0

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Solution for y^2+28y-132=0 equation:


Simplifying
y2 + 28y + -132 = 0

Reorder the terms:
-132 + 28y + y2 = 0

Solving
-132 + 28y + y2 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '132' to each side of the equation.
-132 + 28y + 132 + y2 = 0 + 132

Reorder the terms:
-132 + 132 + 28y + y2 = 0 + 132

Combine like terms: -132 + 132 = 0
0 + 28y + y2 = 0 + 132
28y + y2 = 0 + 132

Combine like terms: 0 + 132 = 132
28y + y2 = 132

The y term is 28y.  Take half its coefficient (14).
Square it (196) and add it to both sides.

Add '196' to each side of the equation.
28y + 196 + y2 = 132 + 196

Reorder the terms:
196 + 28y + y2 = 132 + 196

Combine like terms: 132 + 196 = 328
196 + 28y + y2 = 328

Factor a perfect square on the left side:
(y + 14)(y + 14) = 328

Calculate the square root of the right side: 18.110770276

Break this problem into two subproblems by setting 
(y + 14) equal to 18.110770276 and -18.110770276.

Subproblem 1

y + 14 = 18.110770276 Simplifying y + 14 = 18.110770276 Reorder the terms: 14 + y = 18.110770276 Solving 14 + y = 18.110770276 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-14' to each side of the equation. 14 + -14 + y = 18.110770276 + -14 Combine like terms: 14 + -14 = 0 0 + y = 18.110770276 + -14 y = 18.110770276 + -14 Combine like terms: 18.110770276 + -14 = 4.110770276 y = 4.110770276 Simplifying y = 4.110770276

Subproblem 2

y + 14 = -18.110770276 Simplifying y + 14 = -18.110770276 Reorder the terms: 14 + y = -18.110770276 Solving 14 + y = -18.110770276 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-14' to each side of the equation. 14 + -14 + y = -18.110770276 + -14 Combine like terms: 14 + -14 = 0 0 + y = -18.110770276 + -14 y = -18.110770276 + -14 Combine like terms: -18.110770276 + -14 = -32.110770276 y = -32.110770276 Simplifying y = -32.110770276

Solution

The solution to the problem is based on the solutions from the subproblems. y = {4.110770276, -32.110770276}

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