y^2-y-130=0

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Solution for y^2-y-130=0 equation:


Simplifying
y2 + -1y + -130 = 0

Reorder the terms:
-130 + -1y + y2 = 0

Solving
-130 + -1y + y2 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '130' to each side of the equation.
-130 + -1y + 130 + y2 = 0 + 130

Reorder the terms:
-130 + 130 + -1y + y2 = 0 + 130

Combine like terms: -130 + 130 = 0
0 + -1y + y2 = 0 + 130
-1y + y2 = 0 + 130

Combine like terms: 0 + 130 = 130
-1y + y2 = 130

The y term is -1y.  Take half its coefficient (-0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
-1y + 0.25 + y2 = 130 + 0.25

Reorder the terms:
0.25 + -1y + y2 = 130 + 0.25

Combine like terms: 130 + 0.25 = 130.25
0.25 + -1y + y2 = 130.25

Factor a perfect square on the left side:
(y + -0.5)(y + -0.5) = 130.25

Calculate the square root of the right side: 11.412712211

Break this problem into two subproblems by setting 
(y + -0.5) equal to 11.412712211 and -11.412712211.

Subproblem 1

y + -0.5 = 11.412712211 Simplifying y + -0.5 = 11.412712211 Reorder the terms: -0.5 + y = 11.412712211 Solving -0.5 + y = 11.412712211 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + y = 11.412712211 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + y = 11.412712211 + 0.5 y = 11.412712211 + 0.5 Combine like terms: 11.412712211 + 0.5 = 11.912712211 y = 11.912712211 Simplifying y = 11.912712211

Subproblem 2

y + -0.5 = -11.412712211 Simplifying y + -0.5 = -11.412712211 Reorder the terms: -0.5 + y = -11.412712211 Solving -0.5 + y = -11.412712211 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + y = -11.412712211 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + y = -11.412712211 + 0.5 y = -11.412712211 + 0.5 Combine like terms: -11.412712211 + 0.5 = -10.912712211 y = -10.912712211 Simplifying y = -10.912712211

Solution

The solution to the problem is based on the solutions from the subproblems. y = {11.912712211, -10.912712211}

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