Isolating for r

Question

How do you isolated for r in the following equation?

V=4/3πr²

Answer 1

V = (4/3)πr²

So, πr² = 3V/4

r² = 3V / (4π)

r = (1/2)√(3V/π)

Answer 2

v=4/3 pi r^2 (updated problem)

3/4*V= 4/3*PI*r^2

3V/4=pi*r^2

(3V/4)/pi = pi/pi *r^2

(3V/4)* 1/pi =r^2

r _{= + -} √ 3V/2 pi