36=2r*r

Solution for 36=2r*r equation:

Simplifying
36 = 2r * r

Multiply r * r
36 = 2r2

Solving
36 = 2r2

Solving for variable 'r'.

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

Add '-2r2' to each side of the equation.
36 + -2r2 = 2r2 + -2r2

Combine like terms: 2r2 + -2r2 = 0
36 + -2r2 = 0

Add '-36' to each side of the equation.
36 + -36 + -2r2 = 0 + -36

Combine like terms: 36 + -36 = 0
0 + -2r2 = 0 + -36
-2r2 = 0 + -36

Combine like terms: 0 + -36 = -36
-2r2 = -36

Divide each side by '-2'.
r2 = 18

Simplifying
r2 = 18

Take the square root of each side:
r = {-4.242640687, 4.242640687}