Ответ:
m²-x²-2xy-y² = m²-(x²+2xy+y²) = m²-(x+y)² = (m-(x+y))*(m+(x+y)) = (m-x-y)*(m+x+y)
a²+b²-c²-b² = a²-c² = (a-c)*(a+c)
4-x²+2xy-y² = 4-(x²-2xy+y²) = 4-(x-y)² = (2-(x-y))*(2+(x-y)) = (2-x+y)*(2+x-y)
9a²-b²-24a+16 = (9a²-24a+16) — b² = (3a-4)² — b² = (3a-4-b)*(3a-4+b)