how if the given is like the ff.? how i will factor it?

1)
a^3 - b^3 = (a - b)(a^2 + ab + b^2)

64t^3 - x^3y^12
= (4t - xy^3)(16t^2 + 4txy^3 + x^2y^9)

= = = = = = = =

2)
a^2 - 2ay + y^2 + ca - cy
= a^2 - ay - ay + y^2 + ca - cy
= a^2 + ac - ay + y^2 - ay - cy
= (a^2 + ac - ay) + (y^2 - ay - cy)
= a(a + c - y) + y(y - a - c)
= a(a + c - y) - y(a + c - y)
= (a + c - y)(a - y)

First is (4t)^3 -(xy^4)^3 Now use a^3 - b^3 formula.
Second is (a-y)^2 -c(a-y) =(a-y)(a-y-c)
What is ff?