Question

First four terms of the sequence represented by the expression n(n-1)-4

Answer 1

That's a strange form but:

n^2-n-4

-4, -2, 2, 8

Answer 2

First term is n=1
1(1-1)-4
1(0)-4
-4
first term is -4


2nd term
n=2
2(2-1)-4
2(1)-4
2-4
-2
2nd term is -2

3rd term
n=3
3(3-1)-4
3(2)-4
6-4
2
3rd term is 2

4th term
n=4
4(4-1)-4
4(3)-4
12-4
8
4th term is 8



the first 4 terms are -4, -2, 2, 8