9a^2-225=0

Solution for 9a^2-225=0 equation:

Simplifying
9a2 + -225 = 0

Reorder the terms:
-225 + 9a2 = 0

Solving
-225 + 9a2 = 0

Solving for variable 'a'.

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

Add '225' to each side of the equation.
-225 + 225 + 9a2 = 0 + 225

Combine like terms: -225 + 225 = 0
0 + 9a2 = 0 + 225
9a2 = 0 + 225

Combine like terms: 0 + 225 = 225
9a2 = 225

Divide each side by '9'.
a2 = 25

Simplifying
a2 = 25

Take the square root of each side:
a = {-5, 5}