That doesn't mean up to the 5th term, but up to series values of , so you should have a sum of values for which is four terms.
Hi im a bit stuck on this.
I know the first term is 2, and i just have to cube it, but i was confused as i thought the 5 on the top means the sum up to the fifth term. If i do this, i get
:
Which equals 440. However i checked the answer and it said 224, which is basicly what i did but without the at the end. Anyway i was just wondering if the answer book is right, or if im right because there have been a few mistakes in the answer booklet so far.