y^2+y-128=0

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Solution for y^2+y-128=0 equation:


Simplifying
y2 + y + -128 = 0

Reorder the terms:
-128 + y + y2 = 0

Solving
-128 + y + y2 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '128' to each side of the equation.
-128 + y + 128 + y2 = 0 + 128

Reorder the terms:
-128 + 128 + y + y2 = 0 + 128

Combine like terms: -128 + 128 = 0
0 + y + y2 = 0 + 128
y + y2 = 0 + 128

Combine like terms: 0 + 128 = 128
y + y2 = 128

The y term is y.  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.
y + 0.25 + y2 = 128 + 0.25

Reorder the terms:
0.25 + y + y2 = 128 + 0.25

Combine like terms: 128 + 0.25 = 128.25
0.25 + y + y2 = 128.25

Factor a perfect square on the left side:
(y + 0.5)(y + 0.5) = 128.25

Calculate the square root of the right side: 11.324751653

Break this problem into two subproblems by setting 
(y + 0.5) equal to 11.324751653 and -11.324751653.

Subproblem 1

y + 0.5 = 11.324751653 Simplifying y + 0.5 = 11.324751653 Reorder the terms: 0.5 + y = 11.324751653 Solving 0.5 + y = 11.324751653 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 = 11.324751653 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + y = 11.324751653 + -0.5 y = 11.324751653 + -0.5 Combine like terms: 11.324751653 + -0.5 = 10.824751653 y = 10.824751653 Simplifying y = 10.824751653

Subproblem 2

y + 0.5 = -11.324751653 Simplifying y + 0.5 = -11.324751653 Reorder the terms: 0.5 + y = -11.324751653 Solving 0.5 + y = -11.324751653 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 = -11.324751653 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + y = -11.324751653 + -0.5 y = -11.324751653 + -0.5 Combine like terms: -11.324751653 + -0.5 = -11.824751653 y = -11.824751653 Simplifying y = -11.824751653

Solution

The solution to the problem is based on the solutions from the subproblems. y = {10.824751653, -11.824751653}

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