3r^2-16-64=0

Solution for 3r^2-16-64=0 equation:

Simplifying
3r2 + -16 + -64 = 0

Reorder the terms:
-16 + -64 + 3r2 = 0

Combine like terms: -16 + -64 = -80
-80 + 3r2 = 0

Solving
-80 + 3r2 = 0

Solving for variable 'r'.

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

Add '80' to each side of the equation.
-80 + 80 + 3r2 = 0 + 80

Combine like terms: -80 + 80 = 0
0 + 3r2 = 0 + 80
3r2 = 0 + 80

Combine like terms: 0 + 80 = 80
3r2 = 80

Divide each side by '3'.
r2 = 26.66666667

Simplifying
r2 = 26.66666667

Take the square root of each side:
r = {-5.163977795, 5.163977795}