3r^2-27=0

Solution for 3r^2-27=0 equation:

Simplifying
3r2 + -27 = 0

Reorder the terms:
-27 + 3r2 = 0

Solving
-27 + 3r2 = 0

Solving for variable 'r'.

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

Add '27' to each side of the equation.
-27 + 27 + 3r2 = 0 + 27

Combine like terms: -27 + 27 = 0
0 + 3r2 = 0 + 27
3r2 = 0 + 27

Combine like terms: 0 + 27 = 27
3r2 = 27

Divide each side by '3'.
r2 = 9

Simplifying
r2 = 9

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