Question 629326
  <pre><font face = "Tohoma" size = 3 color = "indigo"><b> 
Hi,
(x^3+y^4)(x^3-y^4) = x^6 - y^8     {{{( x^m )( x^n ) = x^( m + n )}}}
F	First terms    x^6
O	Outside terms -x^3y^4
I	Inside terms  +x^2y^4
L	Last terms   -y^8