Question

If a1 = 8 and an =an-1-3 then find the value of a5

Answer 1

`a_5=-4`

Explanation:

`a_n=a_(n-1)-3\\\\a_1=8\\\\a_2=a_1-3\to a_2=8-3=5\\\\a_3=a_2-3\to a_3=5-3=2\\\\a_4=a_3-3\to a_4=2-3=-1\\\\a_5=a_4-3\to a_5=-1-3=-4`