Find the 7th term of the sequence-1,-2,-4,-8

Question

amistre64 · Answer

can you determine a pattern?

amistre64 · Answer

lets factor out the negative

-(1,2,4,8,...)

might make it clearer

jiteshmeghwal9 · Answer

sorry its asking u to subtract the digit to itself to gt next digit  becoz the digits are negative

anonymous · Answer

What do you mean?

jiteshmeghwal9 · Answer

(-1-1)=(-2-2)=(-4-4) & so on to gt ur seventh term

jiteshmeghwal9 · Answer

do u understand @lovejones2012 ???

anonymous · Answer

hmmmmmmmmm?

jiteshmeghwal9 · Answer

(-4-4)=-8
(-8-8)=-16
(-9-9)=-18

jiteshmeghwal9 · Answer

@amistre64 was also asking u to determine a pattern something like that:)

amistre64 · Answer

-16-16 rather than -9-9 tho ;)

jiteshmeghwal9 · Answer

ya!

anonymous · Answer

So the answer is -16- -16?

parthkohli · Answer

Can't we just say that we are multiplying 2 to get the next term?

anonymous · Answer

I meant to say -16 -16??

parthkohli · Answer

We are making this a little tedious by first subtracting 2 then 4 then 8.. this is a geometric sequence with -1 as $a$ and 2 as $r$!

amistre64 · Answer

if we call the "current term"; An
if we call the "next term"; An+1

we can see that each An+1 term is equal to 2 times the An term

parthkohli · Answer

$T_n = T_{n - 1} \times r$

amistre64 · Answer

Parth, do the interaction of the asker indicate that they are that advanced yet?

parthkohli · Answer

Sorry, Amistre.

anonymous · Answer

So what is the answer? I am confused.....

amistre64 · Answer

the answer is what we get after we go thur the process

parthkohli · Answer

To make it simple, you may just multiply the number that you have already been multiplying to get the next terms in the sequence.

parthkohli · Answer

That special number is $2$!

parthkohli · Answer

Not two factorial, but two.

amistre64 · Answer

1st term = -1
2nd term = 1st term * 2 = -1*2 = -2
3rd term = 2nd term * 2 = -2*2 = -4
4th term = 3rd term * 2 = -4*2 = -8

and it follows this same pattern from 1st to 7th

amistre64 · Answer

so, what would you say the 5th term would be if you follow the pattern laid out?

anonymous · Answer

?

amistre64 · Answer

you will have to be clearer than that since i cannot read minds ....

amistre64 · Answer

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