Donna O.

asked • 04/02/17

a sequence is given by the recursive definition: a (sub1)=7 and a (sub n)=a(sub n-1) (2)^n

state the fourth term of this sequence.  I am expected to show how I arrived at my answer.

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Mark M. answered • 04/02/17

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a1 = 7
an = an-1(2n)
 
a2 = a122
a2 = 7(4)
 
a3 = 28(23)
a3 = 28(8)
 
What is a4?
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Donna O.

thank you!
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04/02/17

Mark M.

You are welcome!
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04/02/17

Jesse K.

Well this is several years old, but I need help!! Everywhere on the internet is step by step on how to solve this a(sub n-1) etc. My book has a question a(sub n+1) and I can not find a single video or explanation that includes the +1. My instructor says it is the same. But it is not. My question is a(sub n+1) = 3a (sub 1) +5.
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09/12/21

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