-2y(2y-4)-y=-2(y-2)

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


Simplifying
-2y(2y + -4) + -1y = -2(y + -2)

Reorder the terms:
-2y(-4 + 2y) + -1y = -2(y + -2)
(-4 * -2y + 2y * -2y) + -1y = -2(y + -2)
(8y + -4y2) + -1y = -2(y + -2)

Reorder the terms:
8y + -1y + -4y2 = -2(y + -2)

Combine like terms: 8y + -1y = 7y
7y + -4y2 = -2(y + -2)

Reorder the terms:
7y + -4y2 = -2(-2 + y)
7y + -4y2 = (-2 * -2 + y * -2)
7y + -4y2 = (4 + -2y)

Solving
7y + -4y2 = 4 + -2y

Solving for variable 'y'.

Reorder the terms:
-4 + 7y + 2y + -4y2 = 4 + -2y + -4 + 2y

Combine like terms: 7y + 2y = 9y
-4 + 9y + -4y2 = 4 + -2y + -4 + 2y

Reorder the terms:
-4 + 9y + -4y2 = 4 + -4 + -2y + 2y

Combine like terms: 4 + -4 = 0
-4 + 9y + -4y2 = 0 + -2y + 2y
-4 + 9y + -4y2 = -2y + 2y

Combine like terms: -2y + 2y = 0
-4 + 9y + -4y2 = 0

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

Divide each side by '-4'.
1 + -2.25y + y2 = 0

Move the constant term to the right:

Add '-1' to each side of the equation.
1 + -2.25y + -1 + y2 = 0 + -1

Reorder the terms:
1 + -1 + -2.25y + y2 = 0 + -1

Combine like terms: 1 + -1 = 0
0 + -2.25y + y2 = 0 + -1
-2.25y + y2 = 0 + -1

Combine like terms: 0 + -1 = -1
-2.25y + y2 = -1

The y term is -2.25y.  Take half its coefficient (-1.125).
Square it (1.265625) and add it to both sides.

Add '1.265625' to each side of the equation.
-2.25y + 1.265625 + y2 = -1 + 1.265625

Reorder the terms:
1.265625 + -2.25y + y2 = -1 + 1.265625

Combine like terms: -1 + 1.265625 = 0.265625
1.265625 + -2.25y + y2 = 0.265625

Factor a perfect square on the left side:
(y + -1.125)(y + -1.125) = 0.265625

Calculate the square root of the right side: 0.515388203

Break this problem into two subproblems by setting 
(y + -1.125) equal to 0.515388203 and -0.515388203.

Subproblem 1

y + -1.125 = 0.515388203 Simplifying y + -1.125 = 0.515388203 Reorder the terms: -1.125 + y = 0.515388203 Solving -1.125 + y = 0.515388203 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1.125' to each side of the equation. -1.125 + 1.125 + y = 0.515388203 + 1.125 Combine like terms: -1.125 + 1.125 = 0.000 0.000 + y = 0.515388203 + 1.125 y = 0.515388203 + 1.125 Combine like terms: 0.515388203 + 1.125 = 1.640388203 y = 1.640388203 Simplifying y = 1.640388203

Subproblem 2

y + -1.125 = -0.515388203 Simplifying y + -1.125 = -0.515388203 Reorder the terms: -1.125 + y = -0.515388203 Solving -1.125 + y = -0.515388203 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1.125' to each side of the equation. -1.125 + 1.125 + y = -0.515388203 + 1.125 Combine like terms: -1.125 + 1.125 = 0.000 0.000 + y = -0.515388203 + 1.125 y = -0.515388203 + 1.125 Combine like terms: -0.515388203 + 1.125 = 0.609611797 y = 0.609611797 Simplifying y = 0.609611797

Solution

The solution to the problem is based on the solutions from the subproblems. y = {1.640388203, 0.609611797}

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