what is the sqare root of x(square root of 9-4 over 3) = square root of 25

I'm making a guess as to what is meant here

x [√(9-4)/3] = 5   multiply both sides by 3

x √5 = 15       divide both sides by √5

x = 15/√5 = (15√5) / 5   =  3√5