Question

Ache o 5 termo da p.a. ( a +b;3a-2b;.....)

Answer 1

r=3a-2b-(a+b)
r=3a-a-2b-b
r=2a-3b

t(5)=t1+(t-1)r
t(5)=a+b+4(2a-3b)
t(5)=a+b+8a-12b
t(5)=9a-11b