y^2-4y-124=0

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Solution for y^2-4y-124=0 equation:


Simplifying
y2 + -4y + -124 = 0

Reorder the terms:
-124 + -4y + y2 = 0

Solving
-124 + -4y + y2 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '124' to each side of the equation.
-124 + -4y + 124 + y2 = 0 + 124

Reorder the terms:
-124 + 124 + -4y + y2 = 0 + 124

Combine like terms: -124 + 124 = 0
0 + -4y + y2 = 0 + 124
-4y + y2 = 0 + 124

Combine like terms: 0 + 124 = 124
-4y + y2 = 124

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 = 124 + 4

Reorder the terms:
4 + -4y + y2 = 124 + 4

Combine like terms: 124 + 4 = 128
4 + -4y + y2 = 128

Factor a perfect square on the left side:
(y + -2)(y + -2) = 128

Calculate the square root of the right side: 11.313708499

Break this problem into two subproblems by setting 
(y + -2) equal to 11.313708499 and -11.313708499.

Subproblem 1

y + -2 = 11.313708499 Simplifying y + -2 = 11.313708499 Reorder the terms: -2 + y = 11.313708499 Solving -2 + y = 11.313708499 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 = 11.313708499 + 2 Combine like terms: -2 + 2 = 0 0 + y = 11.313708499 + 2 y = 11.313708499 + 2 Combine like terms: 11.313708499 + 2 = 13.313708499 y = 13.313708499 Simplifying y = 13.313708499

Subproblem 2

y + -2 = -11.313708499 Simplifying y + -2 = -11.313708499 Reorder the terms: -2 + y = -11.313708499 Solving -2 + y = -11.313708499 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 = -11.313708499 + 2 Combine like terms: -2 + 2 = 0 0 + y = -11.313708499 + 2 y = -11.313708499 + 2 Combine like terms: -11.313708499 + 2 = -9.313708499 y = -9.313708499 Simplifying y = -9.313708499

Solution

The solution to the problem is based on the solutions from the subproblems. y = {13.313708499, -9.313708499}

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