Question 45240
As always, begin by taking out the common factor which will be 8mn:
{{{ 8m^4 - 16 mn^4}}}
{{{8mn(m^3 - 2 n^3) }}}  The answer is C).


For help with factoring the common factor, see my website by clicking on "rapaljer" anywhere in algebra.com, then look for "Basic Algebra" then "Basic Algebra: One Step at a Time", then Chapter 2, Section 2.03 Factoring the Common Factor.  


R^2 at SCC