9k^2+81k=0

Solution for 9k^2+81k=0 equation:

Simplifying
9k2 + 81k = 0

Reorder the terms:
81k + 9k2 = 0

Solving
81k + 9k2 = 0

Solving for variable 'k'.

Factor out the Greatest Common Factor (GCF), '9k'.
9k(9 + k) = 0

Ignore the factor 9.
Subproblem 1
Set the factor 'k' equal to zero and attempt to solve:

Simplifying
k = 0

Solving
k = 0

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

Simplifying
k = 0
Subproblem 2
Set the factor '(9 + k)' equal to zero and attempt to solve:

Simplifying
9 + k = 0

Solving
9 + k = 0

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

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

Combine like terms: 9 + -9 = 0
0 + k = 0 + -9
k = 0 + -9

Combine like terms: 0 + -9 = -9
k = -9

Simplifying
k = -9
Solution
k = {0, -9}