Multiple find the next two terms in the sequence –5, 8, –13, 20, –29, …. write a formula for the nth term. identify the formula as explicit or recursive.

a)40, –53; an = (–1)n • (an – 1 + 2n – 1); explicit
b)39, –50; an = (–1)n • (an – 1 + 2n – 1); explicit
c)40, –53; an = (–1)n • (n2 + 4); recursive
d)none of these

for your ! : )