y^2+16y=-2

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Solution for y^2+16y=-2 equation:


Simplifying
y2 + 16y = -2

Reorder the terms:
16y + y2 = -2

Solving
16y + y2 = -2

Solving for variable 'y'.

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

Combine like terms: -2 + 2 = 0
2 + 16y + y2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-2' to each side of the equation.
2 + 16y + -2 + y2 = 0 + -2

Reorder the terms:
2 + -2 + 16y + y2 = 0 + -2

Combine like terms: 2 + -2 = 0
0 + 16y + y2 = 0 + -2
16y + y2 = 0 + -2

Combine like terms: 0 + -2 = -2
16y + y2 = -2

The y term is 16y.  Take half its coefficient (8).
Square it (64) and add it to both sides.

Add '64' to each side of the equation.
16y + 64 + y2 = -2 + 64

Reorder the terms:
64 + 16y + y2 = -2 + 64

Combine like terms: -2 + 64 = 62
64 + 16y + y2 = 62

Factor a perfect square on the left side:
(y + 8)(y + 8) = 62

Calculate the square root of the right side: 7.874007874

Break this problem into two subproblems by setting 
(y + 8) equal to 7.874007874 and -7.874007874.

Subproblem 1

y + 8 = 7.874007874 Simplifying y + 8 = 7.874007874 Reorder the terms: 8 + y = 7.874007874 Solving 8 + y = 7.874007874 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + y = 7.874007874 + -8 Combine like terms: 8 + -8 = 0 0 + y = 7.874007874 + -8 y = 7.874007874 + -8 Combine like terms: 7.874007874 + -8 = -0.125992126 y = -0.125992126 Simplifying y = -0.125992126

Subproblem 2

y + 8 = -7.874007874 Simplifying y + 8 = -7.874007874 Reorder the terms: 8 + y = -7.874007874 Solving 8 + y = -7.874007874 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + y = -7.874007874 + -8 Combine like terms: 8 + -8 = 0 0 + y = -7.874007874 + -8 y = -7.874007874 + -8 Combine like terms: -7.874007874 + -8 = -15.874007874 y = -15.874007874 Simplifying y = -15.874007874

Solution

The solution to the problem is based on the solutions from the subproblems. y = {-0.125992126, -15.874007874}

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