-2d^2-9d-9=0

Solution for -2d^2-9d-9=0 equation:

Simplifying
-2d2 + -9d + -9 = 0

Reorder the terms:
-9 + -9d + -2d2 = 0

Solving
-9 + -9d + -2d2 = 0

Solving for variable 'd'.

Factor out the Greatest Common Factor (GCF), '-1'.
-1(9 + 9d + 2d2) = 0

Factor a trinomial.
-1((3 + d)(3 + 2d)) = 0

Ignore the factor -1.
Subproblem 1
Set the factor '(3 + d)' equal to zero and attempt to solve:

Simplifying
3 + d = 0

Solving
3 + d = 0

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

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

Combine like terms: 3 + -3 = 0
0 + d = 0 + -3
d = 0 + -3

Combine like terms: 0 + -3 = -3
d = -3

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

Simplifying
3 + 2d = 0

Solving
3 + 2d = 0

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

Add '-3' to each side of the equation.
3 + -3 + 2d = 0 + -3

Combine like terms: 3 + -3 = 0
0 + 2d = 0 + -3
2d = 0 + -3

Combine like terms: 0 + -3 = -3
2d = -3

Divide each side by '2'.
d = -1.5

Simplifying
d = -1.5
Solution
d = {-3, -1.5}