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littlegenesis2
littlegenesis2 littlegenesis2
  • 19-07-2016
  • Mathematics
Answered

A geometric sequence is defined by the explicit formula an=5(-4)^n-1 what is the recursive formula for the nth term of this sequence?

Verified Answer :

caylus
caylus caylus
  • 19-07-2016

Hello,

\(a_{n}=5*(-4)^{n-1}\\ a_{n-1}=5*(-4)^{n-2}\\\\ \dfrac{a_{n}}{a_{n-1}}=(-4)^{n-1-(n-2)}=-4\\\\ Formula\ is\ :\\ a_{n}=-4*a_{n-1}\\ a_{1}=5\\\)

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