anonymous
  • anonymous
PLEASE HELP URGENT ! what is the 7th of the geometric sequence where a1 = 3 and a5 = -768
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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amistre64
  • amistre64
nothings THAT urgent :/
amistre64
  • amistre64
we should start by remembering the general formula for a geometric sequence
amistre64
  • amistre64
an = a1*r^(n-1)

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More answers

amistre64
  • amistre64
we know a1, and we know the value when n=5; from this we can grab the r value
amistre64
  • amistre64
can you fill those in for me?
anonymous
  • anonymous
kind of
amistre64
  • amistre64
give it a try, ill know if its right or not :)
anonymous
  • anonymous
the answer is going to be -3,072
amistre64
  • amistre64
it might be, but lets see if we can build up to that
anonymous
  • anonymous
ok
amistre64
  • amistre64
lets fill in what we are given: a1 = 3 and a5 = -768 when n=5 an = a1 * r^(n-1) a5 = -786 = 3 * r^(5-1) -786/3 = r^(4) -292 = r^(4) , 4rt the whole thing to find r 4rt(-292) = r as is this is not a possible sequence to me. an even root can be negative across the reals
amistre64
  • amistre64
an even root canNOT .... i passed typing class, honest :)
amistre64
  • amistre64
check your problem and make sure you havent got an error in the post
anonymous
  • anonymous
ok
amistre64
  • amistre64
i got a feeling the a1 = -3 for this to work like you want it to
anonymous
  • anonymous
yeah
anonymous
  • anonymous
it is
amistre64
  • amistre64
4rt(292) = r then this is what we get for r take the general formula again, knowing this r and n=7 a7 = -3 * (4rt(292))^(6) and a calculator should popout your intended results
anonymous
  • anonymous
can it be 12,288
amistre64
  • amistre64
no
amistre64
  • amistre64
...can what be?
amistre64
  • amistre64
a7 is going to be a negative value
anonymous
  • anonymous
-12,288
amistre64
  • amistre64
adjust for a mismath and i get: a7 = -3 * 256^(6/4) = -12288 , so yes
anonymous
  • anonymous
can you help me with thi one ? What is the sum of the geometric sequence -4, 28, -196 ?
amistre64
  • amistre64
why did you think that the answer "is going to be -3,072"?
anonymous
  • anonymous
i hd my ngatives wrng
anonymous
  • anonymous
signs
amistre64
  • amistre64
ah, itll prolly be best to post up a new question with that sum in it; i have to go for now

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