Question

What's the rule for the following sequence?

4, 1, -2, -5, …

Answer 1

Subtract -3

Explanation:

4--3 is 1, 1--3 is -2, -2- -3 is -5, when subtracting negatives they add together to from a bigger negative.

Answer 2

7-3n

Explanation:

the difference between 4, 1 is 1 -4= -3

the difference between 1, -2 is-2-1=-3

The formula is a + (n-1)d => 4 + (n-1)-3

=> 4 -3n +3

=> 7-3n