y^2+12y+13=2y^2+4

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Solution for y^2+12y+13=2y^2+4 equation:


Simplifying
y2 + 12y + 13 = 2y2 + 4

Reorder the terms:
13 + 12y + y2 = 2y2 + 4

Reorder the terms:
13 + 12y + y2 = 4 + 2y2

Solving
13 + 12y + y2 = 4 + 2y2

Solving for variable 'y'.

Reorder the terms:
13 + -4 + 12y + y2 + -2y2 = 4 + 2y2 + -4 + -2y2

Combine like terms: 13 + -4 = 9
9 + 12y + y2 + -2y2 = 4 + 2y2 + -4 + -2y2

Combine like terms: y2 + -2y2 = -1y2
9 + 12y + -1y2 = 4 + 2y2 + -4 + -2y2

Reorder the terms:
9 + 12y + -1y2 = 4 + -4 + 2y2 + -2y2

Combine like terms: 4 + -4 = 0
9 + 12y + -1y2 = 0 + 2y2 + -2y2
9 + 12y + -1y2 = 2y2 + -2y2

Combine like terms: 2y2 + -2y2 = 0
9 + 12y + -1y2 = 0

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

Divide each side by '-1'.
-9 + -12y + y2 = 0

Move the constant term to the right:

Add '9' to each side of the equation.
-9 + -12y + 9 + y2 = 0 + 9

Reorder the terms:
-9 + 9 + -12y + y2 = 0 + 9

Combine like terms: -9 + 9 = 0
0 + -12y + y2 = 0 + 9
-12y + y2 = 0 + 9

Combine like terms: 0 + 9 = 9
-12y + y2 = 9

The y term is -12y.  Take half its coefficient (-6).
Square it (36) and add it to both sides.

Add '36' to each side of the equation.
-12y + 36 + y2 = 9 + 36

Reorder the terms:
36 + -12y + y2 = 9 + 36

Combine like terms: 9 + 36 = 45
36 + -12y + y2 = 45

Factor a perfect square on the left side:
(y + -6)(y + -6) = 45

Calculate the square root of the right side: 6.708203933

Break this problem into two subproblems by setting 
(y + -6) equal to 6.708203933 and -6.708203933.

Subproblem 1

y + -6 = 6.708203933 Simplifying y + -6 = 6.708203933 Reorder the terms: -6 + y = 6.708203933 Solving -6 + y = 6.708203933 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + y = 6.708203933 + 6 Combine like terms: -6 + 6 = 0 0 + y = 6.708203933 + 6 y = 6.708203933 + 6 Combine like terms: 6.708203933 + 6 = 12.708203933 y = 12.708203933 Simplifying y = 12.708203933

Subproblem 2

y + -6 = -6.708203933 Simplifying y + -6 = -6.708203933 Reorder the terms: -6 + y = -6.708203933 Solving -6 + y = -6.708203933 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + y = -6.708203933 + 6 Combine like terms: -6 + 6 = 0 0 + y = -6.708203933 + 6 y = -6.708203933 + 6 Combine like terms: -6.708203933 + 6 = -0.708203933 y = -0.708203933 Simplifying y = -0.708203933

Solution

The solution to the problem is based on the solutions from the subproblems. y = {12.708203933, -0.708203933}

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