Question

3. What are the first four terms of the sequence represented by the expression n(n-1)- 5?

Answer 1

-5, -3, 1, 7

Explanation:

n=1

1(1-1)-5=

1(0)-5=

0-5=

-5

n=2

2(2-1)-5=

2(1)-5=

2-5=

-3

n=3

3(3-1)-5=

3(2)-5=

6-5=

1

n=4

4(4-1)-5=

4(3)-5=

12-5=

7

Answer 2

It depends what the starting value of n is defined as

Assuming n starts at 0 it would be:

-5, -5, -3, 1

Assuming n starts at 1 it would be:

-5, -3, 1, 7