Question

Determine a formula do termo geral dd cada PA
(2,7,..)

Answer 1

$PA~(2,7,..)\\\\\\ a_1=2\\\\ r=7-2=5\\\\\\ a_n=a_1+(n-1).r\to \\\\\\ a_n=2+(n-1).5\to \\\\ a_n=2+5n-5\to \\\\ \boxed{a_n=5n-3}$

Answer 2

Ae mano

a fórmula do termo geral é

an=a1+(n-1)r

sendo,

a1=2
r=a2-a1 = 7-2 = 5

só substituir..

an=2+(n-1) . 5
an=2+5n-5
an=5n+2-5

an=5n-3