81k^2-9=0

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

Simplifying
81k2 + -9 = 0

Reorder the terms:
-9 + 81k2 = 0

Solving
-9 + 81k2 = 0

Solving for variable 'k'.

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

Add '9' to each side of the equation.
-9 + 9 + 81k2 = 0 + 9

Combine like terms: -9 + 9 = 0
0 + 81k2 = 0 + 9
81k2 = 0 + 9

Combine like terms: 0 + 9 = 9
81k2 = 9

Divide each side by '81'.
k2 = 0.1111111111

Simplifying
k2 = 0.1111111111

Take the square root of each side:
k = {-0.333333333, 0.333333333}