y^2+4y-8=0

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Solution for y^2+4y-8=0 equation: 


Simplifying
y2 + 4y + -8 = 0

Reorder the terms:
-8 + 4y + y2 = 0

Solving
-8 + 4y + y2 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '8' to each side of the equation.
-8 + 4y + 8 + y2 = 0 + 8

Reorder the terms:
-8 + 8 + 4y + y2 = 0 + 8

Combine like terms: -8 + 8 = 0
0 + 4y + y2 = 0 + 8
4y + y2 = 0 + 8

Combine like terms: 0 + 8 = 8
4y + y2 = 8

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 = 8 + 4

Reorder the terms:
4 + 4y + y2 = 8 + 4

Combine like terms: 8 + 4 = 12
4 + 4y + y2 = 12

Factor a perfect square on the left side:
(y + 2)(y + 2) = 12

Calculate the square root of the right side: 3.464101615

Break this problem into two subproblems by setting 
(y + 2) equal to 3.464101615 and -3.464101615.


Subproblem 1
y + 2 = 3.464101615

Simplifying
y + 2 = 3.464101615

Reorder the terms:
2 + y = 3.464101615

Solving
2 + y = 3.464101615

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 = 3.464101615 + -2

Combine like terms: 2 + -2 = 0
0 + y = 3.464101615 + -2
y = 3.464101615 + -2

Combine like terms: 3.464101615 + -2 = 1.464101615
y = 1.464101615

Simplifying
y = 1.464101615


Subproblem 2
y + 2 = -3.464101615

Simplifying
y + 2 = -3.464101615

Reorder the terms:
2 + y = -3.464101615

Solving
2 + y = -3.464101615

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 = -3.464101615 + -2

Combine like terms: 2 + -2 = 0
0 + y = -3.464101615 + -2
y = -3.464101615 + -2

Combine like terms: -3.464101615 + -2 = -5.464101615
y = -5.464101615

Simplifying
y = -5.464101615


Solution
The solution to the problem is based on the solutions
from the subproblems.
y = {1.464101615, -5.464101615}

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