d^2-20d+99=

Solution for d^2-20d+99= equation:

Simplifying
d2 + -20d + 99 = 0

Reorder the terms:
99 + -20d + d2 = 0

Solving
99 + -20d + d2 = 0

Solving for variable 'd'.

Factor a trinomial.
(9 + -1d)(11 + -1d) = 0

Subproblem 1
Set the factor '(9 + -1d)' equal to zero and attempt to solve:

Simplifying
9 + -1d = 0

Solving
9 + -1d = 0

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

Add '-9' to each side of the equation.
9 + -9 + -1d = 0 + -9

Combine like terms: 9 + -9 = 0
0 + -1d = 0 + -9
-1d = 0 + -9

Combine like terms: 0 + -9 = -9
-1d = -9

Divide each side by '-1'.
d = 9

Simplifying
d = 9
Subproblem 2
Set the factor '(11 + -1d)' equal to zero and attempt to solve:

Simplifying
11 + -1d = 0

Solving
11 + -1d = 0

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

Add '-11' to each side of the equation.
11 + -11 + -1d = 0 + -11

Combine like terms: 11 + -11 = 0
0 + -1d = 0 + -11
-1d = 0 + -11

Combine like terms: 0 + -11 = -11
-1d = -11

Divide each side by '-1'.
d = 11

Simplifying
d = 11
Solution
d = {9, 11}