Question

encontrar o termo geral da p.a (4,7)

Answer 1

$PA~\{4;7;...\}\\\\ a_1=4\\ r=7-4=3\\\\\\ a_n=a_1+(n-1)\times r\\\\\\ a_n=4+(n-1)\times 3\to\\\\ a_n=4+3n- 3\to\\\\ \boxed{a_n=3n+1}$