y^2-5y-20=0

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Solution for y^2-5y-20=0 equation: 


Simplifying
y2 + -5y + -20 = 0

Reorder the terms:
-20 + -5y + y2 = 0

Solving
-20 + -5y + y2 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '20' to each side of the equation.
-20 + -5y + 20 + y2 = 0 + 20

Reorder the terms:
-20 + 20 + -5y + y2 = 0 + 20

Combine like terms: -20 + 20 = 0
0 + -5y + y2 = 0 + 20
-5y + y2 = 0 + 20

Combine like terms: 0 + 20 = 20
-5y + y2 = 20

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 = 20 + 6.25

Reorder the terms:
6.25 + -5y + y2 = 20 + 6.25

Combine like terms: 20 + 6.25 = 26.25
6.25 + -5y + y2 = 26.25

Factor a perfect square on the left side:
(y + -2.5)(y + -2.5) = 26.25

Calculate the square root of the right side: 5.123475383

Break this problem into two subproblems by setting 
(y + -2.5) equal to 5.123475383 and -5.123475383.


Subproblem 1
y + -2.5 = 5.123475383

Simplifying
y + -2.5 = 5.123475383

Reorder the terms:
-2.5 + y = 5.123475383

Solving
-2.5 + y = 5.123475383

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 = 5.123475383 + 2.5

Combine like terms: -2.5 + 2.5 = 0.0
0.0 + y = 5.123475383 + 2.5
y = 5.123475383 + 2.5

Combine like terms: 5.123475383 + 2.5 = 7.623475383
y = 7.623475383

Simplifying
y = 7.623475383


Subproblem 2
y + -2.5 = -5.123475383

Simplifying
y + -2.5 = -5.123475383

Reorder the terms:
-2.5 + y = -5.123475383

Solving
-2.5 + y = -5.123475383

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 = -5.123475383 + 2.5

Combine like terms: -2.5 + 2.5 = 0.0
0.0 + y = -5.123475383 + 2.5
y = -5.123475383 + 2.5

Combine like terms: -5.123475383 + 2.5 = -2.623475383
y = -2.623475383

Simplifying
y = -2.623475383


Solution
The solution to the problem is based on the solutions
from the subproblems.
y = {7.623475383, -2.623475383}

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