9(a^2-9)=0

Solution for 9(a^2-9)=0 equation:

Simplifying
9(a2 + -9) = 0

Reorder the terms:
9(-9 + a2) = 0
(-9 * 9 + a2 * 9) = 0
(-81 + 9a2) = 0

Solving
-81 + 9a2 = 0

Solving for variable 'a'.

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

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

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

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

Divide each side by '9'.
a2 = 9

Simplifying
a2 = 9

Take the square root of each side:
a = {-3, 3}