2r^2-72=

Solution for 2r^2-72= equation:

Simplifying
2r2 + -72 = 0

Reorder the terms:
-72 + 2r2 = 0

Solving
-72 + 2r2 = 0

Solving for variable 'r'.

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

Add '72' to each side of the equation.
-72 + 72 + 2r2 = 0 + 72

Combine like terms: -72 + 72 = 0
0 + 2r2 = 0 + 72
2r2 = 0 + 72

Combine like terms: 0 + 72 = 72
2r2 = 72

Divide each side by '2'.
r2 = 36

Simplifying
r2 = 36

Take the square root of each side:
r = {-6, 6}