Question 791268
These are NOT like terms, so you CANNOT combine them.


You leave them as is. If you want to factor this, then


{{{x^4 + x^7 = x^4(1 + x^3)}}}


then you factor {{{1+x^3}}} to get {{{(1+x)(1 - x + x^2)}}} (sum of cubes rule) to get this final answer


{{{x^4(1 + x)(1 - x + x^2)}}}