y^2+9=2y^2+2y-12

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Solution for y^2+9=2y^2+2y-12 equation:


Simplifying
y2 + 9 = 2y2 + 2y + -12

Reorder the terms:
9 + y2 = 2y2 + 2y + -12

Reorder the terms:
9 + y2 = -12 + 2y + 2y2

Solving
9 + y2 = -12 + 2y + 2y2

Solving for variable 'y'.

Reorder the terms:
9 + 12 + -2y + y2 + -2y2 = -12 + 2y + 2y2 + 12 + -2y + -2y2

Combine like terms: 9 + 12 = 21
21 + -2y + y2 + -2y2 = -12 + 2y + 2y2 + 12 + -2y + -2y2

Combine like terms: y2 + -2y2 = -1y2
21 + -2y + -1y2 = -12 + 2y + 2y2 + 12 + -2y + -2y2

Reorder the terms:
21 + -2y + -1y2 = -12 + 12 + 2y + -2y + 2y2 + -2y2

Combine like terms: -12 + 12 = 0
21 + -2y + -1y2 = 0 + 2y + -2y + 2y2 + -2y2
21 + -2y + -1y2 = 2y + -2y + 2y2 + -2y2

Combine like terms: 2y + -2y = 0
21 + -2y + -1y2 = 0 + 2y2 + -2y2
21 + -2y + -1y2 = 2y2 + -2y2

Combine like terms: 2y2 + -2y2 = 0
21 + -2y + -1y2 = 0

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

Divide each side by '-1'.
-21 + 2y + y2 = 0

Move the constant term to the right:

Add '21' to each side of the equation.
-21 + 2y + 21 + y2 = 0 + 21

Reorder the terms:
-21 + 21 + 2y + y2 = 0 + 21

Combine like terms: -21 + 21 = 0
0 + 2y + y2 = 0 + 21
2y + y2 = 0 + 21

Combine like terms: 0 + 21 = 21
2y + y2 = 21

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 = 21 + 1

Reorder the terms:
1 + 2y + y2 = 21 + 1

Combine like terms: 21 + 1 = 22
1 + 2y + y2 = 22

Factor a perfect square on the left side:
(y + 1)(y + 1) = 22

Calculate the square root of the right side: 4.69041576

Break this problem into two subproblems by setting 
(y + 1) equal to 4.69041576 and -4.69041576.

Subproblem 1

y + 1 = 4.69041576 Simplifying y + 1 = 4.69041576 Reorder the terms: 1 + y = 4.69041576 Solving 1 + y = 4.69041576 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 = 4.69041576 + -1 Combine like terms: 1 + -1 = 0 0 + y = 4.69041576 + -1 y = 4.69041576 + -1 Combine like terms: 4.69041576 + -1 = 3.69041576 y = 3.69041576 Simplifying y = 3.69041576

Subproblem 2

y + 1 = -4.69041576 Simplifying y + 1 = -4.69041576 Reorder the terms: 1 + y = -4.69041576 Solving 1 + y = -4.69041576 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 = -4.69041576 + -1 Combine like terms: 1 + -1 = 0 0 + y = -4.69041576 + -1 y = -4.69041576 + -1 Combine like terms: -4.69041576 + -1 = -5.69041576 y = -5.69041576 Simplifying y = -5.69041576

Solution

The solution to the problem is based on the solutions from the subproblems. y = {3.69041576, -5.69041576}

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