I have been trying to do this question for like a week, and I have had no success.

Question:

Differentiate the function f(x)=(4x)/(sqrt2x)

I have tried it and I know that I have to use the quotient rule but I know I am doing something wrong in this step.

(2x)^1/2 * (4) - (4x) * (x)^-1/2 all divided by (2x)^3/2

Please help me do the multypling out.