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Which recursive sequence would produce the sequence 
9,-32,91,dots ?

a_(1)=9 and 
a_(n)=-3a_(n-1)-5

a_(1)=9 and 
a_(n)=-4a_(n-1)+4

a_(1)=9 and 
a_(n)=-5a_(n-1)-3

a_(1)=9 and 
a_(n)=4a_(n-1)-4

Which recursive sequence would produce the sequence 9,32,91, 9,-32,91, \ldots ?\newlinea1=9 a_{1}=9 and an=3an15 a_{n}=-3 a_{n-1}-5 \newlinea1=9 a_{1}=9 and an=4an1+4 a_{n}=-4 a_{n-1}+4 \newlinea1=9 a_{1}=9 and an=5an13 a_{n}=-5 a_{n-1}-3 \newlinea1=9 a_{1}=9 and an=4an14 a_{n}=4 a_{n-1}-4

Full solution

Q. Which recursive sequence would produce the sequence 9,32,91, 9,-32,91, \ldots ?\newlinea1=9 a_{1}=9 and an=3an15 a_{n}=-3 a_{n-1}-5 \newlinea1=9 a_{1}=9 and an=4an1+4 a_{n}=-4 a_{n-1}+4 \newlinea1=9 a_{1}=9 and an=5an13 a_{n}=-5 a_{n-1}-3 \newlinea1=9 a_{1}=9 and an=4an14 a_{n}=4 a_{n-1}-4
  1. Identify First Term: Identify the first term of the sequence.\newlineThe first term given for all options is a1=9a_{1} = 9.
  2. Calculate Second Term: Use the second option to calculate the second term.\newlineThe second option is an=4an1+4a_{n} = -4a_{n-1} + 4. Let's calculate a2a_{2} using a1=9a_{1} = 9:\newlinea2=4×a1+4=4×9+4=36+4=32a_{2} = -4 \times a_{1} + 4 = -4 \times 9 + 4 = -36 + 4 = -32.\newlineThis matches the second term of the sequence.
  3. Calculate Third Term: Use the second option to calculate the third term.\newlineNow, let's calculate a3a_{3} using a2=32a_{2} = -32:\newlinea3=4×a2+4=4×(32)+4=128+4=132a_{3} = -4 \times a_{2} + 4 = -4 \times (-32) + 4 = 128 + 4 = 132.\newlineThis does not match the third term of the sequence (9191).

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