4=2y(y-5)

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Solution for 4=2y(y-5) equation: 


Simplifying
4 = 2y(y + -5)

Reorder the terms:
4 = 2y(-5 + y)
4 = (-5 * 2y + y * 2y)
4 = (-10y + 2y2)

Solving
4 = -10y + 2y2

Solving for variable 'y'.

Reorder the terms:
4 + 10y + -2y2 = -10y + 10y + 2y2 + -2y2

Combine like terms: -10y + 10y = 0
4 + 10y + -2y2 = 0 + 2y2 + -2y2
4 + 10y + -2y2 = 2y2 + -2y2

Combine like terms: 2y2 + -2y2 = 0
4 + 10y + -2y2 = 0

Factor out the Greatest Common Factor (GCF), '2'.
2(2 + 5y + -1y2) = 0

Ignore the factor 2.

Subproblem 1
Set the factor '(2 + 5y + -1y2)' equal to zero and attempt to solve:

Simplifying
2 + 5y + -1y2 = 0

Solving
2 + 5y + -1y2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-2 + -5y + y2 = 0

Move the constant term to the right:

Add '2' to each side of the equation.
-2 + -5y + 2 + y2 = 0 + 2

Reorder the terms:
-2 + 2 + -5y + y2 = 0 + 2

Combine like terms: -2 + 2 = 0
0 + -5y + y2 = 0 + 2
-5y + y2 = 0 + 2

Combine like terms: 0 + 2 = 2
-5y + y2 = 2

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 = 2 + 6.25

Reorder the terms:
6.25 + -5y + y2 = 2 + 6.25

Combine like terms: 2 + 6.25 = 8.25
6.25 + -5y + y2 = 8.25

Factor a perfect square on the left side:
(y + -2.5)(y + -2.5) = 8.25

Calculate the square root of the right side: 2.872281323

Break this problem into two subproblems by setting 
(y + -2.5) equal to 2.872281323 and -2.872281323.


Subproblem 1
y + -2.5 = 2.872281323

Simplifying
y + -2.5 = 2.872281323

Reorder the terms:
-2.5 + y = 2.872281323

Solving
-2.5 + y = 2.872281323

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 = 2.872281323 + 2.5

Combine like terms: -2.5 + 2.5 = 0.0
0.0 + y = 2.872281323 + 2.5
y = 2.872281323 + 2.5

Combine like terms: 2.872281323 + 2.5 = 5.372281323
y = 5.372281323

Simplifying
y = 5.372281323


Subproblem 2
y + -2.5 = -2.872281323

Simplifying
y + -2.5 = -2.872281323

Reorder the terms:
-2.5 + y = -2.872281323

Solving
-2.5 + y = -2.872281323

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 = -2.872281323 + 2.5

Combine like terms: -2.5 + 2.5 = 0.0
0.0 + y = -2.872281323 + 2.5
y = -2.872281323 + 2.5

Combine like terms: -2.872281323 + 2.5 = -0.372281323
y = -0.372281323

Simplifying
y = -0.372281323


Solution
The solution to the problem is based on the solutions
from the subproblems.
y = {5.372281323, -0.372281323}
Solution
y = {5.372281323, -0.372281323}

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