Question

what is then first three terms of the artithmrtic sequence an+a n-1-4;a1=4

Answer 1

can't read that
but the idea is you already are given the first term called a1=4
the second term is a2 (replace n with 2)

Answer 2

whats the third term

Answer 3

a3
but you have to find a2 before finding a3

Answer 4

so u plug 3 in

Answer 5

well have you first found a2?

Answer 6

and can you give the equation again because you haven't wrote an equation yet

Answer 7

I wonder if you meant
\[a_n+a_{n-1}=-4 \\ \text{ or maybe } a_n+a_{n-1}=4 \]
or maybe you meant neither