2y^2+8y+16=361

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Solution for 2y^2+8y+16=361 equation:


Simplifying
2y2 + 8y + 16 = 361

Reorder the terms:
16 + 8y + 2y2 = 361

Solving
16 + 8y + 2y2 = 361

Solving for variable 'y'.

Reorder the terms:
16 + -361 + 8y + 2y2 = 361 + -361

Combine like terms: 16 + -361 = -345
-345 + 8y + 2y2 = 361 + -361

Combine like terms: 361 + -361 = 0
-345 + 8y + 2y2 = 0

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

Divide each side by '2'.
-172.5 + 4y + y2 = 0

Move the constant term to the right:

Add '172.5' to each side of the equation.
-172.5 + 4y + 172.5 + y2 = 0 + 172.5

Reorder the terms:
-172.5 + 172.5 + 4y + y2 = 0 + 172.5

Combine like terms: -172.5 + 172.5 = 0.0
0.0 + 4y + y2 = 0 + 172.5
4y + y2 = 0 + 172.5

Combine like terms: 0 + 172.5 = 172.5
4y + y2 = 172.5

The y term is 4y.  Take half its coefficient (2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
4y + 4 + y2 = 172.5 + 4

Reorder the terms:
4 + 4y + y2 = 172.5 + 4

Combine like terms: 172.5 + 4 = 176.5
4 + 4y + y2 = 176.5

Factor a perfect square on the left side:
(y + 2)(y + 2) = 176.5

Calculate the square root of the right side: 13.285330256

Break this problem into two subproblems by setting 
(y + 2) equal to 13.285330256 and -13.285330256.

Subproblem 1

y + 2 = 13.285330256 Simplifying y + 2 = 13.285330256 Reorder the terms: 2 + y = 13.285330256 Solving 2 + y = 13.285330256 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + y = 13.285330256 + -2 Combine like terms: 2 + -2 = 0 0 + y = 13.285330256 + -2 y = 13.285330256 + -2 Combine like terms: 13.285330256 + -2 = 11.285330256 y = 11.285330256 Simplifying y = 11.285330256

Subproblem 2

y + 2 = -13.285330256 Simplifying y + 2 = -13.285330256 Reorder the terms: 2 + y = -13.285330256 Solving 2 + y = -13.285330256 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + y = -13.285330256 + -2 Combine like terms: 2 + -2 = 0 0 + y = -13.285330256 + -2 y = -13.285330256 + -2 Combine like terms: -13.285330256 + -2 = -15.285330256 y = -15.285330256 Simplifying y = -15.285330256

Solution

The solution to the problem is based on the solutions from the subproblems. y = {11.285330256, -15.285330256}

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