(5a^2)-45=0

Solution for (5a^2)-45=0 equation:

Simplifying
(5a2) + -45 = 0

Reorder the terms:
-45 + (5a2) = 0

Solving
-45 + (5a2) = 0

Solving for variable 'a'.

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

Add '45' to each side of the equation.
-45 + 45 + (5a2) = 0 + 45

Combine like terms: -45 + 45 = 0
0 + (5a2) = 0 + 45
(5a2) = 0 + 45

Combine like terms: 0 + 45 = 45
(5a2) = 45

Divide each side by '5'.
a2 = 9

Simplifying
a2 = 9

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