d^2+19d+18=0

Solution for d^2+19d+18=0 equation:

Simplifying
d2 + 19d + 18 = 0

Reorder the terms:
18 + 19d + d2 = 0

Solving
18 + 19d + d2 = 0

Solving for variable 'd'.

Factor a trinomial.
(18 + d)(1 + d) = 0

Subproblem 1
Set the factor '(18 + d)' equal to zero and attempt to solve:

Simplifying
18 + d = 0

Solving
18 + d = 0

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

Add '-18' to each side of the equation.
18 + -18 + d = 0 + -18

Combine like terms: 18 + -18 = 0
0 + d = 0 + -18
d = 0 + -18

Combine like terms: 0 + -18 = -18
d = -18

Simplifying
d = -18
Subproblem 2
Set the factor '(1 + d)' equal to zero and attempt to solve:

Simplifying
1 + d = 0

Solving
1 + d = 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 + d = 0 + -1

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

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

Simplifying
d = -1
Solution
d = {-18, -1}