substitute V for x , so it will be similar to a math problem that you might be use to,
M=x2/R First, we need to get R to the opposite side, so instead of dividing, you multiply.
MR=x2 Next instead of x being squared, to get rid of it you would square root it and you need to do same to both sides....
so the square root of MR = x, replace x back with V and you get square root of MR=v