7r^2-72=0

Solution for 7r^2-72=0 equation:

Simplifying
7r2 + -72 = 0

Reorder the terms:
-72 + 7r2 = 0

Solving
-72 + 7r2 = 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 + 7r2 = 0 + 72

Combine like terms: -72 + 72 = 0
0 + 7r2 = 0 + 72
7r2 = 0 + 72

Combine like terms: 0 + 72 = 72
7r2 = 72

Divide each side by '7'.
r2 = 10.28571429

Simplifying
r2 = 10.28571429

Take the square root of each side:
r = {-3.207134904, 3.207134904}