What is the sum of the geometric sequence -4, 24, -144, ... if there are 7 terms?

Question

anonymous · Answer

@tejasvir

anonymous · Answer

okay for this one you know that each term is being multiplied by 6. so you already have three terms. you need four more so, multiply -144 by 6. which will give you the fourth term, multiply the fourth term by 6 to get the fifth term, and then multiply by 6 again to get the 6th term and then once more to get the sevent term and add all teh numbers up and there is your sum

anonymous · Answer

ive done that and I don't get any of the answers on the thing

anonymous · Answer

4th term:  -144 * -6 --> 864
5th term: -5184
6th term 31104
7th term: -186624
sum : -159964

anonymous · Answer

ohhh my 7th term ended up being -1119744 I think I did it too many times. but thank you so much for helping me

anonymous · Answer

yea np:) i hopefully i did the math right:)