# alg2 (sequences)

posted by
**lily**
.

how do i find the pattern for:

-4,8,-12,16

if the last number is negative, multiply by -1 then add 4

if the last number is positive, add 4, then multiply by -1

or how about

term_{n+1} = (abs(term_{n}))*(-1)^n, where term_{1} = -4, n>0

oops that last line should have said:

term_{n+1} = (abs(term_{n})+4)*(-1)^n, where term_{1} = -4, n>0