4d^2-4d-80=0

Solution for 4d^2-4d-80=0 equation:

Simplifying
4d2 + -4d + -80 = 0

Reorder the terms:
-80 + -4d + 4d2 = 0

Solving
-80 + -4d + 4d2 = 0

Solving for variable 'd'.

Factor out the Greatest Common Factor (GCF), '4'.
4(-20 + -1d + d2) = 0

Factor a trinomial.
4((-4 + -1d)(5 + -1d)) = 0

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

Simplifying
-4 + -1d = 0

Solving
-4 + -1d = 0

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

Add '4' to each side of the equation.
-4 + 4 + -1d = 0 + 4

Combine like terms: -4 + 4 = 0
0 + -1d = 0 + 4
-1d = 0 + 4

Combine like terms: 0 + 4 = 4
-1d = 4

Divide each side by '-1'.
d = -4

Simplifying
d = -4
Subproblem 2
Set the factor '(5 + -1d)' equal to zero and attempt to solve:

Simplifying
5 + -1d = 0

Solving
5 + -1d = 0

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

Add '-5' to each side of the equation.
5 + -5 + -1d = 0 + -5

Combine like terms: 5 + -5 = 0
0 + -1d = 0 + -5
-1d = 0 + -5

Combine like terms: 0 + -5 = -5
-1d = -5

Divide each side by '-1'.
d = 5

Simplifying
d = 5
Solution
d = {-4, 5}