Respuestas

2013-08-10T06:47:04+02:00
M^4-2mn^4+n^4 - (m^2+2mn^2+n^2)^2 
m^4-2mn^4+n^4 - m^4-2mn^4+n^4
Se eliminan los factores comunes: m^4 / -m^4
Queda= -4mn^4+2n^4