(y+3)(2y-2)=1

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Solution for (y+3)(2y-2)=1 equation:


Simplifying
(y + 3)(2y + -2) = 1

Reorder the terms:
(3 + y)(2y + -2) = 1

Reorder the terms:
(3 + y)(-2 + 2y) = 1

Multiply (3 + y) * (-2 + 2y)
(3(-2 + 2y) + y(-2 + 2y)) = 1
((-2 * 3 + 2y * 3) + y(-2 + 2y)) = 1
((-6 + 6y) + y(-2 + 2y)) = 1
(-6 + 6y + (-2 * y + 2y * y)) = 1
(-6 + 6y + (-2y + 2y2)) = 1

Combine like terms: 6y + -2y = 4y
(-6 + 4y + 2y2) = 1

Solving
-6 + 4y + 2y2 = 1

Solving for variable 'y'.

Reorder the terms:
-6 + -1 + 4y + 2y2 = 1 + -1

Combine like terms: -6 + -1 = -7
-7 + 4y + 2y2 = 1 + -1

Combine like terms: 1 + -1 = 0
-7 + 4y + 2y2 = 0

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

Divide each side by '2'.
-3.5 + 2y + y2 = 0

Move the constant term to the right:

Add '3.5' to each side of the equation.
-3.5 + 2y + 3.5 + y2 = 0 + 3.5

Reorder the terms:
-3.5 + 3.5 + 2y + y2 = 0 + 3.5

Combine like terms: -3.5 + 3.5 = 0.0
0.0 + 2y + y2 = 0 + 3.5
2y + y2 = 0 + 3.5

Combine like terms: 0 + 3.5 = 3.5
2y + y2 = 3.5

The y term is 2y.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2y + 1 + y2 = 3.5 + 1

Reorder the terms:
1 + 2y + y2 = 3.5 + 1

Combine like terms: 3.5 + 1 = 4.5
1 + 2y + y2 = 4.5

Factor a perfect square on the left side:
(y + 1)(y + 1) = 4.5

Calculate the square root of the right side: 2.121320344

Break this problem into two subproblems by setting 
(y + 1) equal to 2.121320344 and -2.121320344.

Subproblem 1

y + 1 = 2.121320344 Simplifying y + 1 = 2.121320344 Reorder the terms: 1 + y = 2.121320344 Solving 1 + y = 2.121320344 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + y = 2.121320344 + -1 Combine like terms: 1 + -1 = 0 0 + y = 2.121320344 + -1 y = 2.121320344 + -1 Combine like terms: 2.121320344 + -1 = 1.121320344 y = 1.121320344 Simplifying y = 1.121320344

Subproblem 2

y + 1 = -2.121320344 Simplifying y + 1 = -2.121320344 Reorder the terms: 1 + y = -2.121320344 Solving 1 + y = -2.121320344 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + y = -2.121320344 + -1 Combine like terms: 1 + -1 = 0 0 + y = -2.121320344 + -1 y = -2.121320344 + -1 Combine like terms: -2.121320344 + -1 = -3.121320344 y = -3.121320344 Simplifying y = -3.121320344

Solution

The solution to the problem is based on the solutions from the subproblems. y = {1.121320344, -3.121320344}

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