Can someone please help me with this question? Medal and Fan.
Find the sum of a finite geometric sequence from n = 1 to n = 5, using the expression -3(4)n - 1

Question

Can someone please help me with this question? Medal and Fan.
Find the sum of a finite geometric sequence from n = 1 to n = 5, using the expression -3(4)n - 1

misty1212 · Answer

HI!!

anonymous · Answer

Hello!

misty1212 · Answer

that is not such a large number of terms, you can forget the formula and add them up

misty1212 · Answer

but it is not so clear what you meant 
it is 
$$-3\times 4^{n-1}$$?

anonymous · Answer

Yes, That is what I meant, I am sorry!

anonymous · Answer

-1,023
1,223
1,023
-4,374
These are my answer choices as well.

misty1212 · Answer

lol use the equation tool, saves on confusion q

misty1212 · Answer

just add

misty1212 · Answer

$$-3\times 4^0-3\times 4^2-3\times 4^2-3\times 4^3-3\times 4^4$$

misty1212 · Answer

or if you prefer 
$$-3(1+4+4^2+4^3+4^4)$$

anonymous · Answer

Okay, let me try and figure this out really quick.

anonymous · Answer

Do I distribute the -3 into each?

anonymous · Answer

-1023? @misty1212 :)

misty1212 · Answer

idk i didn't do it 
hold on

misty1212 · Answer

http://www.wolframalpha.com/input/?i=-3%281%2B4%2B4%5E2%2B4%5E3%2B4%5E4%29

misty1212 · Answer

you are right $$\color\magenta\heartsuit$$

anonymous · Answer

Yay!!! Thank you so much for the help. Your way made it a lot easier! Thank you so much for the help!