Question

How do you expand `(x-y)^4`?

Answer 1

`(x-y)(x-y)(x-y)(x-y)`

Explanation:

`(x-y)^2 = (x-y)(x-y)`

The rule applies to higher powers as well so

`(x-y)^3 = (x-y)(x-y)(x-y)` and

`(x-y)^4 = (x-y)(x-y)(x-y)(x-y)`