-2b^2-8b-8=0

Solution for -2b^2-8b-8=0 equation:

Simplifying
-2b2 + -8b + -8 = 0

Reorder the terms:
-8 + -8b + -2b2 = 0

Solving
-8 + -8b + -2b2 = 0

Solving for variable 'b'.

Factor out the Greatest Common Factor (GCF), '-2'.
-2(4 + 4b + b2) = 0

Factor a trinomial.
-2((2 + b)(2 + b)) = 0

Ignore the factor -2.
Subproblem 1
Set the factor '(2 + b)' equal to zero and attempt to solve:

Simplifying
2 + b = 0

Solving
2 + b = 0

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

Add '-2' to each side of the equation.
2 + -2 + b = 0 + -2

Combine like terms: 2 + -2 = 0
0 + b = 0 + -2
b = 0 + -2

Combine like terms: 0 + -2 = -2
b = -2

Simplifying
b = -2
Subproblem 2
Set the factor '(2 + b)' equal to zero and attempt to solve:

Simplifying
2 + b = 0

Solving
2 + b = 0

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

Add '-2' to each side of the equation.
2 + -2 + b = 0 + -2

Combine like terms: 2 + -2 = 0
0 + b = 0 + -2
b = 0 + -2

Combine like terms: 0 + -2 = -2
b = -2

Simplifying
b = -2
Solution
b = {-2, -2}