Question

The sum of first `n´ terms of an arithmetic sequence is 5n square +2n square
a) What is the sum of the first two terms of this sequence?
b) write the first two terms of the sequence?


please answer this question
step by step​

Answer 1

Step-by-step explanation:

a

n

=5n

2

+2n

(a) First term =5(1)

2

+2(1)=5+2=7

Sum of the first two terms =5(2)

2

+2(2)=20+4=24.

(b) First term =7

Second term =24−7=17.