81a^2-16=0

Solution for 81a^2-16=0 equation:

Simplifying
81a2 + -16 = 0

Reorder the terms:
-16 + 81a2 = 0

Solving
-16 + 81a2 = 0

Solving for variable 'a'.

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

Add '16' to each side of the equation.
-16 + 16 + 81a2 = 0 + 16

Combine like terms: -16 + 16 = 0
0 + 81a2 = 0 + 16
81a2 = 0 + 16

Combine like terms: 0 + 16 = 16
81a2 = 16

Divide each side by '81'.
a2 = 0.1975308642

Simplifying
a2 = 0.1975308642

Take the square root of each side:
a = {-0.444444444, 0.444444444}