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How do you find nth term rule for #-28,14,-7,7/2,-7/4,...#?

1 Answer

Aug 17, 2016

#a_n = -28(-1/2)^(n-1)#

Explanation:

#(-7)/14 = -1/2 " and " 14/(-28) = -1/2#

It is a GP with #a_1 =-28# and Common ratio = #r =-1/2#

#a_n = ar^(n-1)#

#a_n = -28(-1/2)^(n-1)#

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