81a^2-9=

Solution for 81a^2-9= equation:

Simplifying
81a2 + -9 = 0

Reorder the terms:
-9 + 81a2 = 0

Solving
-9 + 81a2 = 0

Solving for variable 'a'.

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

Add '9' to each side of the equation.
-9 + 9 + 81a2 = 0 + 9

Combine like terms: -9 + 9 = 0
0 + 81a2 = 0 + 9
81a2 = 0 + 9

Combine like terms: 0 + 9 = 9
81a2 = 9

Divide each side by '81'.
a2 = 0.1111111111

Simplifying
a2 = 0.1111111111

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