k^2+15k+36=0

Solution for k^2+15k+36=0 equation:

Simplifying
k2 + 15k + 36 = 0

Reorder the terms:
36 + 15k + k2 = 0

Solving
36 + 15k + k2 = 0

Solving for variable 'k'.

Factor a trinomial.
(12 + k)(3 + k) = 0

Subproblem 1
Set the factor '(12 + k)' equal to zero and attempt to solve:

Simplifying
12 + k = 0

Solving
12 + k = 0

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

Add '-12' to each side of the equation.
12 + -12 + k = 0 + -12

Combine like terms: 12 + -12 = 0
0 + k = 0 + -12
k = 0 + -12

Combine like terms: 0 + -12 = -12
k = -12

Simplifying
k = -12
Subproblem 2
Set the factor '(3 + k)' equal to zero and attempt to solve:

Simplifying
3 + k = 0

Solving
3 + k = 0

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

Add '-3' to each side of the equation.
3 + -3 + k = 0 + -3

Combine like terms: 3 + -3 = 0
0 + k = 0 + -3
k = 0 + -3

Combine like terms: 0 + -3 = -3
k = -3

Simplifying
k = -3
Solution
k = {-12, -3}