Question

Which expression is a difference of cubes?

9w^33-y^12

18p^115-9^21

36a^22-b^16

64c^15-d^27

Answer 1

c i believe do you know why??

Answer 2

no

Answer 3

because for the cubes its the same thing as multiplying

Answer 4

Only exponents which are multiples of 3 can be rewritten as cubes.

Example: the 33 exponent is 11*3.
We're able to pull a 3 out, so it can be written as a cube.

22 is 2*11, this does not contain a 3.
So the 22 can not be written as a cube.