Will medal and fan What is the sum of the geometric sequence -4, 24, -144 . . . if there are 6 terms? -159,963 26,660 26,661 159,963

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Will medal and fan What is the sum of the geometric sequence -4, 24, -144 . . . if there are 6 terms? -159,963 26,660 26,661 159,963

Mathematics
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do 144 times neg 6 and that times neg 6 and that again times neg 6 to get all 6 terms
then add them
I did and the answer I got isn't the same as the options

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Other answers:

you mean the sum of geometric series not sequence?
No it says sequence
first you need to find all the 6 terms then sum up
you have three terms so you are missing three more to make 6 terms
what is the fourth term?
864, -5184, 31104 thee are the next three terms. At least that's what I got. If I add them up I don't get one of the answers they provide
hmm really then you must of made a mistake
how did you get the fourth term for example
\[-144 \times -6 = 864\]
yes!
you should get the right answer i don't where you missed
let's try doing the fomula \[S_n=\frac{a(1-r^n)}{(1-r)}\]
a=first term n=6 r=-6
@Tarynrachelle where you going?
I'm still here I'm doing the problem
well low and behold i get one of the answer choices
you should get the right answer once you do the calculations
The third answer?
and actually i get the correct answer even the method i told you in the start without formula. all of them should work since the formula came from it to begin with
no
Idk what I'm doing wrong then.
well to me they all give the same answer, something must be wrong in yur work
anyway you got the formula, you got the other way just see where you had missed things
did you do it yet?
use the formula
Okay well this is what I plug into the formula\[S _{n}=\frac{ 4(1-(-6)^{6}) }{ (1-(-6)) }\] am I wrong?
yeah
That's supposed to be a -4
yes -4 not 4 just about to say that
Is it still wrong even with the -4? Or is it correct with the -4?
it is correct with -4
Okay. Hold on I think I see where I messed up
Nope still not getting one of the answer choices..
I plug it into my calculator and get 186614. That's the same answer I get when I add them all up
Could you explain the steps for me so I know what I'm doing wrong?
hold a sec
ok back
how did you put it in your calc?
\[-4(1-(6)^6)\div(1-(6))\]
no bottom is (1-(-6))=1+6
where are the negatives of 6?
My calculator wasn't getting the right answer but this is it http://www.wolframalpha.com/input/?i=-4%281-%28-6%29%5E6%29%2F%281-%28-6%29%29
well for the top you didn;t have to worry a lot of that negative since you have an even power but bottom no
It's the second choice
yes!
i think you put the wrong format into your calc
Probably. But thank you
No problem

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