3d^2-36d-39=0

Solution for 3d^2-36d-39=0 equation:

Simplifying
3d2 + -36d + -39 = 0

Reorder the terms:
-39 + -36d + 3d2 = 0

Solving
-39 + -36d + 3d2 = 0

Solving for variable 'd'.

Factor out the Greatest Common Factor (GCF), '3'.
3(-13 + -12d + d2) = 0

Factor a trinomial.
3((-1 + -1d)(13 + -1d)) = 0

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

Simplifying
-1 + -1d = 0

Solving
-1 + -1d = 0

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

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

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

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

Divide each side by '-1'.
d = -1

Simplifying
d = -1
Subproblem 2
Set the factor '(13 + -1d)' equal to zero and attempt to solve:

Simplifying
13 + -1d = 0

Solving
13 + -1d = 0

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

Add '-13' to each side of the equation.
13 + -13 + -1d = 0 + -13

Combine like terms: 13 + -13 = 0
0 + -1d = 0 + -13
-1d = 0 + -13

Combine like terms: 0 + -13 = -13
-1d = -13

Divide each side by '-1'.
d = 13

Simplifying
d = 13
Solution
d = {-1, 13}