y^2+7y+2=0

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Solution for y^2+7y+2=0 equation: 


Simplifying
y2 + 7y + 2 = 0

Reorder the terms:
2 + 7y + y2 = 0

Solving
2 + 7y + y2 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '-2' to each side of the equation.
2 + 7y + -2 + y2 = 0 + -2

Reorder the terms:
2 + -2 + 7y + y2 = 0 + -2

Combine like terms: 2 + -2 = 0
0 + 7y + y2 = 0 + -2
7y + y2 = 0 + -2

Combine like terms: 0 + -2 = -2
7y + y2 = -2

The y term is 7y.  Take half its coefficient (3.5).
Square it (12.25) and add it to both sides.

Add '12.25' to each side of the equation.
7y + 12.25 + y2 = -2 + 12.25

Reorder the terms:
12.25 + 7y + y2 = -2 + 12.25

Combine like terms: -2 + 12.25 = 10.25
12.25 + 7y + y2 = 10.25

Factor a perfect square on the left side:
(y + 3.5)(y + 3.5) = 10.25

Calculate the square root of the right side: 3.201562119

Break this problem into two subproblems by setting 
(y + 3.5) equal to 3.201562119 and -3.201562119.


Subproblem 1
y + 3.5 = 3.201562119

Simplifying
y + 3.5 = 3.201562119

Reorder the terms:
3.5 + y = 3.201562119

Solving
3.5 + y = 3.201562119

Solving for variable 'y'.

Move all terms containing y to the left, all other terms to the right.

Add '-3.5' to each side of the equation.
3.5 + -3.5 + y = 3.201562119 + -3.5

Combine like terms: 3.5 + -3.5 = 0.0
0.0 + y = 3.201562119 + -3.5
y = 3.201562119 + -3.5

Combine like terms: 3.201562119 + -3.5 = -0.298437881
y = -0.298437881

Simplifying
y = -0.298437881


Subproblem 2
y + 3.5 = -3.201562119

Simplifying
y + 3.5 = -3.201562119

Reorder the terms:
3.5 + y = -3.201562119

Solving
3.5 + y = -3.201562119

Solving for variable 'y'.

Move all terms containing y to the left, all other terms to the right.

Add '-3.5' to each side of the equation.
3.5 + -3.5 + y = -3.201562119 + -3.5

Combine like terms: 3.5 + -3.5 = 0.0
0.0 + y = -3.201562119 + -3.5
y = -3.201562119 + -3.5

Combine like terms: -3.201562119 + -3.5 = -6.701562119
y = -6.701562119

Simplifying
y = -6.701562119


Solution
The solution to the problem is based on the solutions
from the subproblems.
y = {-0.298437881, -6.701562119}

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