How to simplify this easy expression $3\cdot(4x)^2 \cdot 4$
How do I simplify that expression? I know it's easy but I suck at math so a detailed explanation would be much appreciated. 

Recall that $(ab)^2 = a^2 b^2$, and after using that, it is simply a matter of multiplication, remembering that multiplication is commutative, so $a \cdot b = b\cdot a$:
$$3(4x)^2 \cdot 4 \; = \; 3(4)^2\cdot (x)^2 \cdot 4 \;= \; 3\cdot 16 x^2 \cdot 4 \;= \;192x^2$$
