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Second term of the sequence

F(n)=2f(n-1)+4

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Michael J. | Effective High School STEM Tutor & CUNY Math Peer LeaderEffective High School STEM Tutor & CUNY ...
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The second term of this recursive sequence is
 
f(2) = 2f(2 - 1) + 4
f(2) = 2f(1) + 4
 
Generally, you multiply the first term by 2, then add 4 to get your second term.

Comments

To find what number is f(2), you need to know f(1)--then you apply the recursive formula, as Michael J. Says.
Without knowing the starter value,i.e. what f(1) is, you cannot compute f(2).