-d^2+4d-4=0

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

Simplifying
-1d2 + 4d + -4 = 0

Reorder the terms:
-4 + 4d + -1d2 = 0

Solving
-4 + 4d + -1d2 = 0

Solving for variable 'd'.

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

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

Simplifying
-2 + d = 0

Solving
-2 + d = 0

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

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

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

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

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

Simplifying
2 + -1d = 0

Solving
2 + -1d = 0

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

Add '-2' to each side of the equation.
2 + -2 + -1d = 0 + -2

Combine like terms: 2 + -2 = 0
0 + -1d = 0 + -2
-1d = 0 + -2

Combine like terms: 0 + -2 = -2
-1d = -2

Divide each side by '-1'.
d = 2

Simplifying
d = 2
Solution
d = {2, 2}