2y^2-4y-8=y^2+y

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Solution for 2y^2-4y-8=y^2+y equation:


Simplifying
2y2 + -4y + -8 = y2 + y

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

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

Solving
-8 + -4y + 2y2 = y + y2

Solving for variable 'y'.

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

Combine like terms: -4y + -1y = -5y
-8 + -5y + 2y2 + -1y2 = y + y2 + -1y + -1y2

Combine like terms: 2y2 + -1y2 = 1y2
-8 + -5y + 1y2 = y + y2 + -1y + -1y2

Reorder the terms:
-8 + -5y + 1y2 = y + -1y + y2 + -1y2

Combine like terms: y + -1y = 0
-8 + -5y + 1y2 = 0 + y2 + -1y2
-8 + -5y + 1y2 = y2 + -1y2

Combine like terms: y2 + -1y2 = 0
-8 + -5y + 1y2 = 0

Begin completing the square.

Move the constant term to the right:

Add '8' to each side of the equation.
-8 + -5y + 8 + y2 = 0 + 8

Reorder the terms:
-8 + 8 + -5y + y2 = 0 + 8

Combine like terms: -8 + 8 = 0
0 + -5y + y2 = 0 + 8
-5y + y2 = 0 + 8

Combine like terms: 0 + 8 = 8
-5y + y2 = 8

The y term is -5y.  Take half its coefficient (-2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
-5y + 6.25 + y2 = 8 + 6.25

Reorder the terms:
6.25 + -5y + y2 = 8 + 6.25

Combine like terms: 8 + 6.25 = 14.25
6.25 + -5y + y2 = 14.25

Factor a perfect square on the left side:
(y + -2.5)(y + -2.5) = 14.25

Calculate the square root of the right side: 3.774917218

Break this problem into two subproblems by setting 
(y + -2.5) equal to 3.774917218 and -3.774917218.

Subproblem 1

y + -2.5 = 3.774917218 Simplifying y + -2.5 = 3.774917218 Reorder the terms: -2.5 + y = 3.774917218 Solving -2.5 + y = 3.774917218 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + y = 3.774917218 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + y = 3.774917218 + 2.5 y = 3.774917218 + 2.5 Combine like terms: 3.774917218 + 2.5 = 6.274917218 y = 6.274917218 Simplifying y = 6.274917218

Subproblem 2

y + -2.5 = -3.774917218 Simplifying y + -2.5 = -3.774917218 Reorder the terms: -2.5 + y = -3.774917218 Solving -2.5 + y = -3.774917218 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + y = -3.774917218 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + y = -3.774917218 + 2.5 y = -3.774917218 + 2.5 Combine like terms: -3.774917218 + 2.5 = -1.274917218 y = -1.274917218 Simplifying y = -1.274917218

Solution

The solution to the problem is based on the solutions from the subproblems. y = {6.274917218, -1.274917218}

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