Usually the answers are expected to be looking “neat”. So what does that mean? That usually means that you would want to remove all negative signs (having everything in brackets as positive), have smaller numbers, have smaller powers.
So for Example
-7x^2-4xy would be considered as not the simplest “neatest” form
-x (7x + 4y) would be considered as “neater” as we have taken out negatives and powers.
Hope this makes sense!