a^2+11a+18=-12

Solution for a^2+11a+18=-12 equation:

Simplifying
a2 + 11a + 18 = -12

Reorder the terms:
18 + 11a + a2 = -12

Solving
18 + 11a + a2 = -12

Solving for variable 'a'.

Reorder the terms:
18 + 12 + 11a + a2 = -12 + 12

Combine like terms: 18 + 12 = 30
30 + 11a + a2 = -12 + 12

Combine like terms: -12 + 12 = 0
30 + 11a + a2 = 0

Factor a trinomial.
(6 + a)(5 + a) = 0

Subproblem 1
Set the factor '(6 + a)' equal to zero and attempt to solve:

Simplifying
6 + a = 0

Solving
6 + a = 0

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

Add '-6' to each side of the equation.
6 + -6 + a = 0 + -6

Combine like terms: 6 + -6 = 0
0 + a = 0 + -6
a = 0 + -6

Combine like terms: 0 + -6 = -6
a = -6

Simplifying
a = -6
Subproblem 2
Set the factor '(5 + a)' equal to zero and attempt to solve:

Simplifying
5 + a = 0

Solving
5 + a = 0

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

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

Combine like terms: 5 + -5 = 0
0 + a = 0 + -5
a = 0 + -5

Combine like terms: 0 + -5 = -5
a = -5

Simplifying
a = -5
Solution
a = {-6, -5}