Thanks, i think i understand what i was doing wrong with how i was looking at it, for example, 2x^2 + 2x^2 = 4x^2, if x=2 then 4x^2 = 16 which is the same as 2^3+2^3 which equals 16.
looking at how they are the same helps me to see the obvious mistake i was making, i was looking at 2^3 and was...