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anonymous

  • 5 years ago

find the next three terms in the geometric system 4,-8,16,-32

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  1. anonymous
    • 5 years ago
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    In a geometric sequence, each term is the term before it multiplied by some number. So if that number is r, then find r if 4*r = -8 Figure out what number that is then multiply that number by the last term to get the next.

  2. anonymous
    • 5 years ago
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    thanks for your help but i still dont get it

  3. anonymous
    • 5 years ago
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    multiply each term by (-2)

  4. anonymous
    • 5 years ago
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    what times 4 = -8? 4 * -2, right? So as you see with each term, -8 * -2 is 16 16*-2 is -32 So we figured out the pattern! Now just multiply -32 by -2 to find the next term.

  5. anonymous
    • 5 years ago
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    ohhhhh thats what i was missing... because i had positive 2 instead of negative thanks :)

  6. anonymous
    • 5 years ago
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    No problem :) Whenever you have alternating signs in a geometric series, that means that r is negative!

  7. anonymous
    • 5 years ago
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    how about which number is next in the geometric system 40,100,250,625

  8. anonymous
    • 5 years ago
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    Remember that in a geometric series each term is the term before it multiplied by a number. Just figure out what number that is then find the next term. So 40*that number=100 what number would you multiply by 40 to get 100?

  9. anonymous
    • 5 years ago
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    are you a teacher?

  10. anonymous
    • 5 years ago
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    40*2.5=100

  11. anonymous
    • 5 years ago
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    the answer is 1562.5? thats what i got

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