Question

How do you expand (x4−y3)3?

Answer 1

did you mean

(x^4 - x^3)^3

then I can't answer if you mean

( 4x -3x )^3

then

64x^3-27x^3-36x^2(4x-3x)

or

64x^3-27x^3-144x^3+108x^3