Question

Ache o quinto termo da P.A (a+b;3a-2b;.....).

Answer 1

$r=3a-2b-(a+b)=3a-2b-a-b=2a-3b\\ \\ a_5=a_1+4.r\\ \\ a_5=a+b+4(2a-3b)\\ \\ a_5=a+b+8a-12b\\ \\ \boxed{a_5=9a-11b}$