Y^2-5=-Y^2-2Y

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Solution for Y^2-5=-Y^2-2Y equation:


Simplifying
Y2 + -5 = -1Y2 + -2Y

Reorder the terms:
-5 + Y2 = -1Y2 + -2Y

Reorder the terms:
-5 + Y2 = -2Y + -1Y2

Solving
-5 + Y2 = -2Y + -1Y2

Solving for variable 'Y'.

Reorder the terms:
-5 + 2Y + Y2 + Y2 = -2Y + -1Y2 + 2Y + Y2

Combine like terms: Y2 + Y2 = 2Y2
-5 + 2Y + 2Y2 = -2Y + -1Y2 + 2Y + Y2

Reorder the terms:
-5 + 2Y + 2Y2 = -2Y + 2Y + -1Y2 + Y2

Combine like terms: -2Y + 2Y = 0
-5 + 2Y + 2Y2 = 0 + -1Y2 + Y2
-5 + 2Y + 2Y2 = -1Y2 + Y2

Combine like terms: -1Y2 + Y2 = 0
-5 + 2Y + 2Y2 = 0

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

Divide each side by '2'.
-2.5 + Y + Y2 = 0

Move the constant term to the right:

Add '2.5' to each side of the equation.
-2.5 + Y + 2.5 + Y2 = 0 + 2.5

Reorder the terms:
-2.5 + 2.5 + Y + Y2 = 0 + 2.5

Combine like terms: -2.5 + 2.5 = 0.0
0.0 + Y + Y2 = 0 + 2.5
Y + Y2 = 0 + 2.5

Combine like terms: 0 + 2.5 = 2.5
Y + Y2 = 2.5

The Y term is Y.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
 + 0.25 + Y2 = 2.5 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + Y2 = 2.5 + 0.25

Combine like terms: 2.5 + 0.25 = 2.75
1.25 + Y2 = 2.75

Factor a perfect square on the left side:
(Y + 0.5)(Y + 0.5) = 2.75

Calculate the square root of the right side: 1.658312395

Break this problem into two subproblems by setting 
(Y + 0.5) equal to 1.658312395 and -1.658312395.

Subproblem 1

Y + 0.5 = 1.658312395 Simplifying Y + 0.5 = 1.658312395 Reorder the terms: 0.5 + Y = 1.658312395 Solving 0.5 + Y = 1.658312395 Solving for variable 'Y'. Move all terms containing Y to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + Y = 1.658312395 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + Y = 1.658312395 + -0.5 Y = 1.658312395 + -0.5 Combine like terms: 1.658312395 + -0.5 = 1.158312395 Y = 1.158312395 Simplifying Y = 1.158312395

Subproblem 2

Y + 0.5 = -1.658312395 Simplifying Y + 0.5 = -1.658312395 Reorder the terms: 0.5 + Y = -1.658312395 Solving 0.5 + Y = -1.658312395 Solving for variable 'Y'. Move all terms containing Y to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + Y = -1.658312395 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + Y = -1.658312395 + -0.5 Y = -1.658312395 + -0.5 Combine like terms: -1.658312395 + -0.5 = -2.158312395 Y = -2.158312395 Simplifying Y = -2.158312395

Solution

The solution to the problem is based on the solutions from the subproblems. Y = {1.158312395, -2.158312395}

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