900=r^2

Solution for 900=r^2 equation:

Simplifying
900 = r2

Solving
900 = r2

Solving for variable 'r'.

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

Add '-1r2' to each side of the equation.
900 + -1r2 = r2 + -1r2

Combine like terms: r2 + -1r2 = 0
900 + -1r2 = 0

Add '-900' to each side of the equation.
900 + -900 + -1r2 = 0 + -900

Combine like terms: 900 + -900 = 0
0 + -1r2 = 0 + -900
-1r2 = 0 + -900

Combine like terms: 0 + -900 = -900
-1r2 = -900

Divide each side by '-1'.
r2 = 900

Simplifying
r2 = 900

Take the square root of each side:
r = {-30, 30}