I'm kind of confused as to what exactly simplified means by deffintion which one is more simple

Question

(2x)^6 or 64x^6

I thought simplified meant to do all the operation that can be done... but I've had some teachers who've makred that wrong because I didn't factor...

So what exactly does it mean to be simplified

b.t.w. I figuered out the other problem

sin^-1 (4/5) = (ln ((4i +3)/5))/i
check the calculator it's correct it was extremely hard lol

Answer 1

For a teacher to have marked
64x^6 compared to (2x)^6 as "wrong" is inexcusable .