Question

Write an
explicit formula for An, the nth term of the sequence
15, 7, -1,....

Answer 1

aₙ=23 - 8n

Explanation:

15, 7, -1,....

AP with the first term of 15 and common difference -8

aₙ=a₁+(n-1)d= 15+(n-1)*(-8)= 15 -8n +8= 23 - 8n

aₙ=23 - 8n