Which recursive sequence would produce the sequence 1,−2,−11,… ?a1=1 and an=2an−1−4a1=1 and an=3an−1−5a1=1 and an=−5an−1+3a1=1 and an=−4an−1+2
Q. Which recursive sequence would produce the sequence 1,−2,−11,… ?a1=1 and an=2an−1−4a1=1 and an=3an−1−5a1=1 and an=−5an−1+3a1=1 and an=−4an−1+2
Test Recursive Formula: Let's start by testing each given recursive formula with the initial value a1=1 to see which one produces the sequence 1,−2,−11,….We will begin with the first option:a1=1 and an=2an−1−4We need to calculate a2 using the initial value a1=1.a2=2a1−4a2=2(1)−4a2=2−4a2=−2So far, the sequence matches: 1,−2,−11,…0. Now let's calculate 1,−2,−11,…1.1,−2,−11,…21,−2,−11,…31,−2,−11,…41,−2,−11,…5The third term we calculated is 1,−2,−11,…6, but the third term in the given sequence is 1,−2,−11,…7. Therefore, this recursive formula does not produce the given sequence.
More problems from Find derivatives of using multiple formulae