factorize m²-3mn-88n²

solution  :  by splitting middle term -3mn as  -11mn+8mn  (product of -11mn and 8mn  is -88m^2n^2)

m^2-3mn-88n^2 

=  m^2-11mn+8mn-88n^2

 = m(m-11n)+8n(m-11n) 

= (m+8n)(m-11n)