2 1
-5
-4
-3
- 2
-1
0
1
2
3
4
1
2.
-3
-4
5
O a
Oь
О с
Od
Оe
Of
Os
Oh
yn-1/5x+3
у 1/4x
у 2х
ун-32x+1
у 3х+2
у - 1/5x-2
у 2x+1
ун-5х5

hello from mrbilldoesmath!

answer:

a(n) - a(n-1) -3

discussion:

this ones a bit interesting. given a(n) = 5 - 3n consider this:

a(n-1) = 5 - 3(n-1)

          = (5 - 3n) + 3             => but a(n) = 5 - 3n, the first term

          = a(n)   + 3                 => subtract 3 from both sides

a(n-1) -3 = a(n)  

or

a(n) - a(n-1) -3

you,

mrb

ab will be equal to