Here's the question you clicked on:
unheard
http://www.sketchtoy.com/38070766 @amistre64 What would the exponent be for 5x? I think it's 5x^2 but, I'm unsure.
when you take 3 xs aways from 5xs .. whats left?
3 xs, from 5 xs leaves 2 xs; so yes
your fancy little green stuff give a clue ... theres only 2 xs left in it :)
http://www.sketchtoy.com/38073552 Is this correct?
the end result is fine ... if theres an error it is in the factoring of 8 2.2.2.2 does not equal 8