Question

Write the first five terms of each of the sequences in Exercises 1 to 6 whose nth terms are: an = n (n + 2).

Answer 1

an = n(n+2)
Substituting n = 1, 2, 3, 4, and 5, we obtain
a1= 1(1+2)=3
a2= 2(2+2)=8
a3= 3(3+2)=15
a4= 4(4+2)=24
a5= 5(5+2)=35
Therefore, the required terms are 3, 8, 15, 24, and 35.