Question

Express in simplest form.

1. -4/x^3 + 9/x + 2/x^2
2. 7/10x^2 + 1/2x^3 + 11/5x
3. a + 4/3a + 2a - 1/5a^2

Answer 1

I wonder if a^-3 is simpler than 1/a^3

I have never in my life heard it was, perhaps your teacher went to some school that taught such nonsense.

in 3) there are two terms that can be combined to give 3a

Otherwise, I don't see anything simpler, perhaps I have missed something.