Find an explicit function rule for the sequence -4, 1, 6, 11, .... Use the formula a(n) = a (1) + (n+1)d and simplify fully.

asked Sep 28, 2016 157k views

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by Tix

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$a_1=-4\\ d=a_(n+1)-a_n\\ d=1-(-4)=1+4=5\\\\ a_n=-4+(n+1)\cdot5\\ a_n=-4+5n+5\\ a_n=5n+1$

Paul Freez answered Oct 1, 2016

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