y^2-5y-8=0

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Solution for y^2-5y-8=0 equation: 


Simplifying
y2 + -5y + -8 = 0

Reorder the terms:
-8 + -5y + y2 = 0

Solving
-8 + -5y + y2 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '8' to each side of the equation.
-8 + -5y + 8 + y2 = 0 + 8

Reorder the terms:
-8 + 8 + -5y + y2 = 0 + 8

Combine like terms: -8 + 8 = 0
0 + -5y + y2 = 0 + 8
-5y + y2 = 0 + 8

Combine like terms: 0 + 8 = 8
-5y + y2 = 8

The y term is -5y.  Take half its coefficient (-2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
-5y + 6.25 + y2 = 8 + 6.25

Reorder the terms:
6.25 + -5y + y2 = 8 + 6.25

Combine like terms: 8 + 6.25 = 14.25
6.25 + -5y + y2 = 14.25

Factor a perfect square on the left side:
(y + -2.5)(y + -2.5) = 14.25

Calculate the square root of the right side: 3.774917218

Break this problem into two subproblems by setting 
(y + -2.5) equal to 3.774917218 and -3.774917218.


Subproblem 1
y + -2.5 = 3.774917218

Simplifying
y + -2.5 = 3.774917218

Reorder the terms:
-2.5 + y = 3.774917218

Solving
-2.5 + y = 3.774917218

Solving for variable 'y'.

Move all terms containing y to the left, all other terms to the right.

Add '2.5' to each side of the equation.
-2.5 + 2.5 + y = 3.774917218 + 2.5

Combine like terms: -2.5 + 2.5 = 0.0
0.0 + y = 3.774917218 + 2.5
y = 3.774917218 + 2.5

Combine like terms: 3.774917218 + 2.5 = 6.274917218
y = 6.274917218

Simplifying
y = 6.274917218


Subproblem 2
y + -2.5 = -3.774917218

Simplifying
y + -2.5 = -3.774917218

Reorder the terms:
-2.5 + y = -3.774917218

Solving
-2.5 + y = -3.774917218

Solving for variable 'y'.

Move all terms containing y to the left, all other terms to the right.

Add '2.5' to each side of the equation.
-2.5 + 2.5 + y = -3.774917218 + 2.5

Combine like terms: -2.5 + 2.5 = 0.0
0.0 + y = -3.774917218 + 2.5
y = -3.774917218 + 2.5

Combine like terms: -3.774917218 + 2.5 = -1.274917218
y = -1.274917218

Simplifying
y = -1.274917218


Solution
The solution to the problem is based on the solutions
from the subproblems.
y = {6.274917218, -1.274917218}

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