# Momentum Flux: Quick Question (Product Rule)

by andrew.c
Tags: flux, momentum, product, rule
 P: 47 1. The problem statement, all variables and given/known data Heya, I can expand the term on the LHs and get the term on the RHS no problem :) But, I don't understand how the bottom line is arrived at; I think its basically just a backward engineering of the product rule, but I can't get it! Any help would be useful Attached Thumbnails
 P: 937 $$\frac{\partial(\rho u u)}{\partial x} = \rho u \frac{\partial u}{\partial x} + u \frac{\partial (\rho u)}{\partial x}.$$
 P: 47 Thanks That was easier than I thought!

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