Question 881700
<pre>
Just like {{{A^2-B^2}}}{{{""=""}}}{{{(A-B)(A+B)}}}

-----------------------------------

{{{matrix(1,3,(x-1)^2,""-"", 9(y-1)^2)}}}

{{{matrix(1,5,

"[",(x-1)-3(y-1),"][",(x-1)+3(y-1),"]"


)}}}

{{{matrix(1,5,

"(",x-1-3y+3,")(",x-1+3y-3,")"


)}}}  

{{{matrix(1,5,

"(",x-3y+2,")(",x+3y-4,")"


)}}}

Edwin</pre>