a^2+8a+6=0

Solution for a^2+8a+6=0 equation:

Simplifying
a2 + 8a + 6 = 0

Reorder the terms:
6 + 8a + a2 = 0

Solving
6 + 8a + a2 = 0

Solving for variable 'a'.

Begin completing the square.

Move the constant term to the right:

Add '-6' to each side of the equation.
6 + 8a + -6 + a2 = 0 + -6

Reorder the terms:
6 + -6 + 8a + a2 = 0 + -6

Combine like terms: 6 + -6 = 0
0 + 8a + a2 = 0 + -6
8a + a2 = 0 + -6

Combine like terms: 0 + -6 = -6
8a + a2 = -6

The a term is 8a.  Take half its coefficient (4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
8a + 16 + a2 = -6 + 16

Reorder the terms:
16 + 8a + a2 = -6 + 16

Combine like terms: -6 + 16 = 10
16 + 8a + a2 = 10

Factor a perfect square on the left side:
(a + 4)(a + 4) = 10

Calculate the square root of the right side: 3.16227766

Break this problem into two subproblems by setting 
(a + 4) equal to 3.16227766 and -3.16227766.

Subproblem 1
a + 4 = 3.16227766

Simplifying
a + 4 = 3.16227766

Reorder the terms:
4 + a = 3.16227766

Solving
4 + a = 3.16227766

Solving for variable 'a'.

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

Add '-4' to each side of the equation.
4 + -4 + a = 3.16227766 + -4

Combine like terms: 4 + -4 = 0
0 + a = 3.16227766 + -4
a = 3.16227766 + -4

Combine like terms: 3.16227766 + -4 = -0.83772234
a = -0.83772234

Simplifying
a = -0.83772234

Subproblem 2
a + 4 = -3.16227766

Simplifying
a + 4 = -3.16227766

Reorder the terms:
4 + a = -3.16227766

Solving
4 + a = -3.16227766

Solving for variable 'a'.

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

Add '-4' to each side of the equation.
4 + -4 + a = -3.16227766 + -4

Combine like terms: 4 + -4 = 0
0 + a = -3.16227766 + -4
a = -3.16227766 + -4

Combine like terms: -3.16227766 + -4 = -7.16227766
a = -7.16227766

Simplifying
a = -7.16227766

Solution
The solution to the problem is based on the solutions
from the subproblems.
a = {-0.83772234, -7.16227766}