Question

The first term of a sequence is -12. The recursive formula for the sequence is an = an-1 + 9. What are the next 3 terms in the sequence?

Answer 1

Hello :
by : an = an-1 + 9. 
n= 2 : a2 =a1+9
         a2 = -12+9 = -3
n=3 : a3 = a2 +9 
        a3 = -3+9 = 6
n = 4 : a4 = a3 +9
           a4 =6+9 = 15