Question

encontre o termo geral da P.A (3,7,11..)

Answer 1

a1 = 3
r = 7-3= 4

an = a1 + (n-1)r
an = 3 + (n-1)4
an = 3 + 4n - 4
an = 4n - 1

Answer 2

a1=3 ; r=>7-3=>4

an=a1+(n-1)*r

an=3+(n-1)*4

an=3+4n-4

an=4n-1