-12a^2-16a-4=0

Solution for -12a^2-16a-4=0 equation:

Simplifying
-12a2 + -16a + -4 = 0

Reorder the terms:
-4 + -16a + -12a2 = 0

Solving
-4 + -16a + -12a2 = 0

Solving for variable 'a'.

Factor out the Greatest Common Factor (GCF), '-4'.
-4(1 + 4a + 3a2) = 0

Factor a trinomial.
-4((1 + a)(1 + 3a)) = 0

Ignore the factor -4.
Subproblem 1
Set the factor '(1 + a)' equal to zero and attempt to solve:

Simplifying
1 + a = 0

Solving
1 + a = 0

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

Add '-1' to each side of the equation.
1 + -1 + a = 0 + -1

Combine like terms: 1 + -1 = 0
0 + a = 0 + -1
a = 0 + -1

Combine like terms: 0 + -1 = -1
a = -1

Simplifying
a = -1
Subproblem 2
Set the factor '(1 + 3a)' equal to zero and attempt to solve:

Simplifying
1 + 3a = 0

Solving
1 + 3a = 0

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

Add '-1' to each side of the equation.
1 + -1 + 3a = 0 + -1

Combine like terms: 1 + -1 = 0
0 + 3a = 0 + -1
3a = 0 + -1

Combine like terms: 0 + -1 = -1
3a = -1

Divide each side by '3'.
a = -0.3333333333

Simplifying
a = -0.3333333333
Solution
a = {-1, -0.3333333333}