Question

The sum of first n terms of an arithmetic sequence is 5n + 2n.

a) What is the sum of first two terms of sequence?

b)Write the first two terms of this sequence?​

Answer 1

Step-by-step explanation:

sn=5n+2n

a) Sum of first two terms of sequence is

s2=5(2)+2(2)

s2=10+4

s2=14

b)the first two terms of sequence is

a1=s1=5+2=7

a2=s2-s1=14-7=7

first term is 7

second term is 7