9r^2-256=0

Solution for 9r^2-256=0 equation:

Simplifying
9r2 + -256 = 0

Reorder the terms:
-256 + 9r2 = 0

Solving
-256 + 9r2 = 0

Solving for variable 'r'.

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

Add '256' to each side of the equation.
-256 + 256 + 9r2 = 0 + 256

Combine like terms: -256 + 256 = 0
0 + 9r2 = 0 + 256
9r2 = 0 + 256

Combine like terms: 0 + 256 = 256
9r2 = 256

Divide each side by '9'.
r2 = 28.44444444

Simplifying
r2 = 28.44444444

Take the square root of each side:
r = {-5.333333333, 5.333333333}