Question

(04.06 LC)

The first four terms of a sequence are shown below:
9,5, 1,-3
Which of the following functions best defines this sequence?
an = an-1-4; where a1 = 9
an = an-1 +5; where a1 = 9
an = an-1 +4; where a1 = 9
O
an = an-1-5; where a1 = 9

Answer 1

`a_n=a_(n-1)-4.`

Explanation:

1) if the given sequence is 9;5;1;-3, then a₁=9; a₂=5; a₃=1 and a₄=-3 and

2) the difference is -4.

3) if the difference is -4, then the correct answer is A: aₙ=aₙ₋₁ - 4.