Rearranging period of pendulum equation to find length

[Adam17]

Homework Statement

What is
T=2pi[(sqrt)l/g] rearranged for l= ?

Homework Equations

The Attempt at a Solution

Ive tried a few but I just don't know how to do this with sqrt's of a fraction involved.

 

[grzz]

Eliminate the square root by squaring both sides.

 

[Adam17]

Ok,so what I end up with after that is l=T^2g/2pi. Which is wrong as its not giving me the correct answer.

 

[TSny]

When you square both sides, don't forget that you also have to square the factor of 2$\pi$