2y+4=(5-4y)y

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

Simplifying
2y + 4 = (5 + -4y) * y

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

Reorder the terms for easier multiplication:
4 + 2y = y(5 + -4y)
4 + 2y = (5 * y + -4y * y)
4 + 2y = (5y + -4y2)

Solving
4 + 2y = 5y + -4y2

Solving for variable 'y'.

Combine like terms: 2y + -5y = -3y
4 + -3y + 4y2 = 5y + -4y2 + -5y + 4y2

Reorder the terms:
4 + -3y + 4y2 = 5y + -5y + -4y2 + 4y2

Combine like terms: 5y + -5y = 0
4 + -3y + 4y2 = 0 + -4y2 + 4y2
4 + -3y + 4y2 = -4y2 + 4y2

Combine like terms: -4y2 + 4y2 = 0
4 + -3y + 4y2 = 0

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

Divide each side by '4'.
1 + -0.75y + y2 = 0

Move the constant term to the right:

Add '-1' to each side of the equation.
1 + -0.75y + -1 + y2 = 0 + -1

Reorder the terms:
1 + -1 + -0.75y + y2 = 0 + -1

Combine like terms: 1 + -1 = 0
0 + -0.75y + y2 = 0 + -1
-0.75y + y2 = 0 + -1

Combine like terms: 0 + -1 = -1
-0.75y + y2 = -1

The y term is -0.75y.  Take half its coefficient (-0.375).
Square it (0.140625) and add it to both sides.

Add '0.140625' to each side of the equation.
-0.75y + 0.140625 + y2 = -1 + 0.140625

Reorder the terms:
0.140625 + -0.75y + y2 = -1 + 0.140625

Combine like terms: -1 + 0.140625 = -0.859375
0.140625 + -0.75y + y2 = -0.859375

Factor a perfect square on the left side:
(y + -0.375)(y + -0.375) = -0.859375

Can't calculate square root of the right side.

The solution to this equation could not be determined.