Question

What are the first four terms if the sequence represented by the expression n (n-1) -4?

Answer 1

We have that
n (n-1) -4

for n=1
a1=1*(1-1)-4------> a1=-4

for n=2
a2=2*(2-1)-4------> a2=-2

for n=3
a3=3*(3-1)-4------> a3=2

for n=4
a4=4*(4-1)-4------> a4=8

the answer is
-4,-2, 2, 8