15a^m+2b+12a^m+1b²-3a^mb^3
=3a^mb(5a²+4ab-b²)
=3a^mb(5a-b)(a+b)
a²(x-y)+b²(y-x)
=(x-y)(a-b)(a+b)
-a^3-4a²+12a
=-a(a-3)(a+4)
(x+y)²-4(x+y-1)
=(x+y-2)²
a²(x-y)+b²(y-x)
=(x-y)(a-b)(a+b)
15a^m+2b+12a^m+1b²-3a^mb^3
=3a^mb(5a²+4ab-b²)
=3a^mb(5a-b)(a+b)
a²(x-y)+b²(y-x)
=(x-y)(a-b)(a+b)
-a^3-4a²+12a
=-a(a-3)(a+4)
(x+y)²-4(x+y-1)
=(x+y-2)²
a²(x-y)+b²(y-x)
=(x-y)(a-b)(a+b)