When u square a bracket all the numbers are squared and all powers are doubled
azure anchor
When u square a bracket all the numbers are squared and all powers are doubled
So the first bracket becomes 64h^6k^-10
And the second one is simplified to 10k^6
When u multiply 2 terms with the same base but different powers u just add the powers
So when u multiply these together u get 640h^6k^-4