y^2-2y-104=0

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Solution for y^2-2y-104=0 equation:


Simplifying
y2 + -2y + -104 = 0

Reorder the terms:
-104 + -2y + y2 = 0

Solving
-104 + -2y + y2 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '104' to each side of the equation.
-104 + -2y + 104 + y2 = 0 + 104

Reorder the terms:
-104 + 104 + -2y + y2 = 0 + 104

Combine like terms: -104 + 104 = 0
0 + -2y + y2 = 0 + 104
-2y + y2 = 0 + 104

Combine like terms: 0 + 104 = 104
-2y + y2 = 104

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 = 104 + 1

Reorder the terms:
1 + -2y + y2 = 104 + 1

Combine like terms: 104 + 1 = 105
1 + -2y + y2 = 105

Factor a perfect square on the left side:
(y + -1)(y + -1) = 105

Calculate the square root of the right side: 10.246950766

Break this problem into two subproblems by setting 
(y + -1) equal to 10.246950766 and -10.246950766.

Subproblem 1

y + -1 = 10.246950766 Simplifying y + -1 = 10.246950766 Reorder the terms: -1 + y = 10.246950766 Solving -1 + y = 10.246950766 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 = 10.246950766 + 1 Combine like terms: -1 + 1 = 0 0 + y = 10.246950766 + 1 y = 10.246950766 + 1 Combine like terms: 10.246950766 + 1 = 11.246950766 y = 11.246950766 Simplifying y = 11.246950766

Subproblem 2

y + -1 = -10.246950766 Simplifying y + -1 = -10.246950766 Reorder the terms: -1 + y = -10.246950766 Solving -1 + y = -10.246950766 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 = -10.246950766 + 1 Combine like terms: -1 + 1 = 0 0 + y = -10.246950766 + 1 y = -10.246950766 + 1 Combine like terms: -10.246950766 + 1 = -9.246950766 y = -9.246950766 Simplifying y = -9.246950766

Solution

The solution to the problem is based on the solutions from the subproblems. y = {11.246950766, -9.246950766}

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