Question

A sequence {an} is generated by the recursive formulas a1 = 5 and an = an-1 + 5(-1)n. Find, a343, the 343rd term of the sequence.

Answer 1

that is
\[a_n=a_{n-1}+5(-1)^n \] ?

Answer 2

anyways
the first thing i would so is see if there is a pattern by finding the first few terms in the sequence

Answer 3

so we are given the first term in the sequence is 5 (a_1=5)
now we need to find a_2
can you do that?