3a^2-15=0

Solution for 3a^2-15=0 equation:

Simplifying
3a2 + -15 = 0

Reorder the terms:
-15 + 3a2 = 0

Solving
-15 + 3a2 = 0

Solving for variable 'a'.

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

Add '15' to each side of the equation.
-15 + 15 + 3a2 = 0 + 15

Combine like terms: -15 + 15 = 0
0 + 3a2 = 0 + 15
3a2 = 0 + 15

Combine like terms: 0 + 15 = 15
3a2 = 15

Divide each side by '3'.
a2 = 5

Simplifying
a2 = 5

Take the square root of each side:
a = {-2.236067978, 2.236067978}