Question

1. a 1 =-4; a n =2a n-1 -1 (for n>=2)

2. a 1 = 2/5 ,a 2 = 4/5 ;a n =a n-2 •a(for n >= 3)

Answer 1

so just plug and chug

a1 = -4
a2 = 2a1 - 1 = 2(-4)-1 = -9
a3 = 2a2 - 1 = ...
and so on

a1 = 2/5
a2 = 4/5
a3 = a1-a2 = 2/5 - 4/5 = -2/5
and so on
I think. You have a typo.