# Homework Help: Inequalities Question

1. Mar 18, 2013

### synkk

I need help with the second part, I've managed to get through all of the part (i), but I have no idea where to really start with part (ii), any hints to start me off and I'll keep posting how I'm doing.

thanks

2. Mar 18, 2013

### tiny-tim

hi synkk!

(i don't know whether this works , but …)

i'd try rewriting it as a + b + c ≥ 3abc

3. Mar 18, 2013

### dirk_mec1

Hint: the last equality can be rewritten as:
$$\frac{trs^2 + rst^2+ tsr^2}{rst}$$