y^2+16y-4=0

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Solution for y^2+16y-4=0 equation: 


Simplifying
y2 + 16y + -4 = 0

Reorder the terms:
-4 + 16y + y2 = 0

Solving
-4 + 16y + y2 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '4' to each side of the equation.
-4 + 16y + 4 + y2 = 0 + 4

Reorder the terms:
-4 + 4 + 16y + y2 = 0 + 4

Combine like terms: -4 + 4 = 0
0 + 16y + y2 = 0 + 4
16y + y2 = 0 + 4

Combine like terms: 0 + 4 = 4
16y + y2 = 4

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 = 4 + 64

Reorder the terms:
64 + 16y + y2 = 4 + 64

Combine like terms: 4 + 64 = 68
64 + 16y + y2 = 68

Factor a perfect square on the left side:
(y + 8)(y + 8) = 68

Calculate the square root of the right side: 8.246211251

Break this problem into two subproblems by setting 
(y + 8) equal to 8.246211251 and -8.246211251.


Subproblem 1
y + 8 = 8.246211251

Simplifying
y + 8 = 8.246211251

Reorder the terms:
8 + y = 8.246211251

Solving
8 + y = 8.246211251

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 = 8.246211251 + -8

Combine like terms: 8 + -8 = 0
0 + y = 8.246211251 + -8
y = 8.246211251 + -8

Combine like terms: 8.246211251 + -8 = 0.246211251
y = 0.246211251

Simplifying
y = 0.246211251


Subproblem 2
y + 8 = -8.246211251

Simplifying
y + 8 = -8.246211251

Reorder the terms:
8 + y = -8.246211251

Solving
8 + y = -8.246211251

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 = -8.246211251 + -8

Combine like terms: 8 + -8 = 0
0 + y = -8.246211251 + -8
y = -8.246211251 + -8

Combine like terms: -8.246211251 + -8 = -16.246211251
y = -16.246211251

Simplifying
y = -16.246211251


Solution
The solution to the problem is based on the solutions
from the subproblems.
y = {0.246211251, -16.246211251}

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