Question

Help please !!!
What is the recursive rule for an=−3n+1 ?
an=
a1=

Answer 1

• a[n] = a[n -1] -3
• a[1] = -2

Explanation:

To find a1, put 1 in the given equation and evaluate.

... a1 = -3·1 +1

... a1 = -2

Each time n increases by 1, an is 3 less than the previous value. So, you can write the recursion relation as ...

... a[n] = a[n-1] - 3