Question

What are the first four terms of the sequence modeled by the recursive formula mc001-1.jpg, when mc001-2.jpg?
–3, –8, –13, –18
–3, 2, 7, 12
–3, –15, –75, –375
–3, 1, 5, 9

Answer 1

If a1 = −3 and an = a_{n−1} + 5, then
a1 = −3
a2 = −3 + 5 = 2
a3 = 2 + 5 = 7
a4 = 7 + 5 = 12

So the first four terms are: −3, 2, 7, 12.