Here's the question you clicked on:
dessie91
5^4√7 - 8^3√7 - 2^4√7 - ^3√7 Would the answer be 3^4√7 - 9^3√7? Or do I combine them all because the square roots are all the same?
you got the right answer and you can't go further since roots are not the same
A good way to think about this is set sq(7) = x so you have 3^4x -9^3x
it makes it easier to see you can add them