144=r^2*9

Solution for 144=r^2*9 equation:

Simplifying
144 = r2 * 9

Reorder the terms for easier multiplication:
144 = 9r2

Solving
144 = 9r2

Solving for variable 'r'.

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

Add '-9r2' to each side of the equation.
144 + -9r2 = 9r2 + -9r2

Combine like terms: 9r2 + -9r2 = 0
144 + -9r2 = 0

Add '-144' to each side of the equation.
144 + -144 + -9r2 = 0 + -144

Combine like terms: 144 + -144 = 0
0 + -9r2 = 0 + -144
-9r2 = 0 + -144

Combine like terms: 0 + -144 = -144
-9r2 = -144

Divide each side by '-9'.
r2 = 16

Simplifying
r2 = 16

Take the square root of each side:
r = {-4, 4}