2+2Y-Y^2=0

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Solution for 2+2Y-Y^2=0 equation:


Simplifying
2 + 2Y + -1Y2 = 0

Solving
2 + 2Y + -1Y2 = 0

Solving for variable 'Y'.

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

Divide each side by '-1'.
-2 + -2Y + Y2 = 0

Move the constant term to the right:

Add '2' to each side of the equation.
-2 + -2Y + 2 + Y2 = 0 + 2

Reorder the terms:
-2 + 2 + -2Y + Y2 = 0 + 2

Combine like terms: -2 + 2 = 0
0 + -2Y + Y2 = 0 + 2
-2Y + Y2 = 0 + 2

Combine like terms: 0 + 2 = 2
-2Y + Y2 = 2

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 = 2 + 1

Reorder the terms:
1 + -2Y + Y2 = 2 + 1

Combine like terms: 2 + 1 = 3
1 + -2Y + Y2 = 3

Factor a perfect square on the left side:
(Y + -1)(Y + -1) = 3

Calculate the square root of the right side: 1.732050808

Break this problem into two subproblems by setting 
(Y + -1) equal to 1.732050808 and -1.732050808.

Subproblem 1

Y + -1 = 1.732050808 Simplifying Y + -1 = 1.732050808 Reorder the terms: -1 + Y = 1.732050808 Solving -1 + Y = 1.732050808 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 = 1.732050808 + 1 Combine like terms: -1 + 1 = 0 0 + Y = 1.732050808 + 1 Y = 1.732050808 + 1 Combine like terms: 1.732050808 + 1 = 2.732050808 Y = 2.732050808 Simplifying Y = 2.732050808

Subproblem 2

Y + -1 = -1.732050808 Simplifying Y + -1 = -1.732050808 Reorder the terms: -1 + Y = -1.732050808 Solving -1 + Y = -1.732050808 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 = -1.732050808 + 1 Combine like terms: -1 + 1 = 0 0 + Y = -1.732050808 + 1 Y = -1.732050808 + 1 Combine like terms: -1.732050808 + 1 = -0.732050808 Y = -0.732050808 Simplifying Y = -0.732050808

Solution

The solution to the problem is based on the solutions from the subproblems. Y = {2.732050808, -0.732050808}

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