anonymous
  • anonymous
what is the 7th term of the geometric sequence -1,4,-16,...? Answers to choose from. a)-16,384 b)-4,096 c)4,096 d)16,384
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
\[T _{n}=ar ^{n-1}\]
anonymous
  • anonymous
a= first term r = ratio between consecutive terms n = number of terms
anonymous
  • anonymous
ok

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anonymous
  • anonymous
@yummydum
anonymous
  • anonymous
@geoffb
anonymous
  • anonymous
Can anybody solve this??
anonymous
  • anonymous
Yeah, use @Skaematik's formula. Just plug in what you know.
anonymous
  • anonymous
To get \(r\), what are you multiplying between each term?
anonymous
  • anonymous
@Skaematik are you sure the formula is right i got -4,096 and i dont believe that to be correct
anonymous
  • anonymous
-1 times what gives you 4? 4 times what gives you -16?
anonymous
  • anonymous
-4
anonymous
  • anonymous
Well, the first thing to check is that it's negative. Since it's odd, and your odd terms are negative, it makes sense that it, too, is negative.
anonymous
  • anonymous
ok
anonymous
  • anonymous
Why don't you think -4096 is correct?
anonymous
  • anonymous
because i thought it would have came out positive to 4,096 but i got -4,096
anonymous
  • anonymous
-4096 is correct.
anonymous
  • anonymous
ohh thank you both of you @geoffb @Skaematik

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