What is the explicit formula of 15, 10, 5, 0, -5, -10,...?

1 Answer
Alan P.
Feb 25, 2016

#a_n=15-5n#

Explanation:

#a_0=15#

#a_ncolor(white)("Xx")=a_(n-1)-5# (every term is 5 less than previous term)

#color(white)("XXX")=a_(n-2)-5xx2#

#color(white)("XXX")=a_(n-i)-5xxi#

#color(white)("XXX")=a_0-5xxn#

#color(white)("XXX")=15-5n#

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