anonymous
  • anonymous
What are the next three terms of the sequence 1, -3, 9, -27,…? A. -54, 162, -486 B. -81, 243, -729 C. 81, -243, 729 D. 57, -162, 486
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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tkhunny
  • tkhunny
Ridiculous problem. Finite sequences have infinitely many "next three terms". ANYTHING you can justify is an acceptable answer. 1, -3, 9, -27, 0, -2, 5 -- That works. 1, -3, 9, -27, 28, -29, 5 -- That works. 1, -3, 9, -27, \(\sqrt{5}\), \(\pi\), e -- That works. What say you? Give us a clue what YOU might think are three acceptable values and justify your response.
anonymous
  • anonymous
Well, I thought it was 57, -162, 486, but I really wasn't sure, so I came on here for some help..
tkhunny
  • tkhunny
It's not a matter of being sure. It's a matter of justifying your answer. How did you get those three values?

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More answers

anonymous
  • anonymous
If you're having trouble with this, try breaking it down. The sequence itself has 4 values in it already. What did the 1 do to become -3?
tkhunny
  • tkhunny
Generally, it's a good idea to look for common differences or common ratios. Subtract each successive pair. What do you get? Divide each successive pair. What do you get?
anonymous
  • anonymous
i really don't understand
Loser66
  • Loser66
1*(-3) =?
anonymous
  • anonymous
-3
Loser66
  • Loser66
Now, second term -3*(-3) =?
anonymous
  • anonymous
9
Loser66
  • Loser66
Now, third term 9*(-3) =?
anonymous
  • anonymous
-27
Loser66
  • Loser66
can you see your answers are the term of the given sequence??
anonymous
  • anonymous
oh, yeah! Thank you so much! I get it now :)
Loser66
  • Loser66
so, next will be???
anonymous
  • anonymous
81
anonymous
  • anonymous
then it'll be -243
Loser66
  • Loser66
Yes!! look at your options, which is correct.
anonymous
  • anonymous
c! Thanks again :)
Loser66
  • Loser66
No need to do next, since there is only 1 option which starts at 81, It is C
Loser66
  • Loser66
YOu got it. hehehe...

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