y^2-4y-24=0

Solution for y^2-4y-24=0 equation:

Simplifying
y2 + -4y + -24 = 0

Reorder the terms:
-24 + -4y + y2 = 0

Solving
-24 + -4y + y2 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '24' to each side of the equation.
-24 + -4y + 24 + y2 = 0 + 24

Reorder the terms:
-24 + 24 + -4y + y2 = 0 + 24

Combine like terms: -24 + 24 = 0
0 + -4y + y2 = 0 + 24
-4y + y2 = 0 + 24

Combine like terms: 0 + 24 = 24
-4y + y2 = 24

The y term is -4y.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4y + 4 + y2 = 24 + 4

Reorder the terms:
4 + -4y + y2 = 24 + 4

Combine like terms: 24 + 4 = 28
4 + -4y + y2 = 28

Factor a perfect square on the left side:
(y + -2)(y + -2) = 28

Calculate the square root of the right side: 5.291502622

Break this problem into two subproblems by setting 
(y + -2) equal to 5.291502622 and -5.291502622.

Subproblem 1
y + -2 = 5.291502622

Simplifying
y + -2 = 5.291502622

Reorder the terms:
-2 + y = 5.291502622

Solving
-2 + y = 5.291502622

Solving for variable 'y'.

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

Add '2' to each side of the equation.
-2 + 2 + y = 5.291502622 + 2

Combine like terms: -2 + 2 = 0
0 + y = 5.291502622 + 2
y = 5.291502622 + 2

Combine like terms: 5.291502622 + 2 = 7.291502622
y = 7.291502622

Simplifying
y = 7.291502622

Subproblem 2
y + -2 = -5.291502622

Simplifying
y + -2 = -5.291502622

Reorder the terms:
-2 + y = -5.291502622

Solving
-2 + y = -5.291502622

Solving for variable 'y'.

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

Add '2' to each side of the equation.
-2 + 2 + y = -5.291502622 + 2

Combine like terms: -2 + 2 = 0
0 + y = -5.291502622 + 2
y = -5.291502622 + 2

Combine like terms: -5.291502622 + 2 = -3.291502622
y = -3.291502622

Simplifying
y = -3.291502622

Solution
The solution to the problem is based on the solutions
from the subproblems.
y = {7.291502622, -3.291502622}