this doesn’t make any sense

Answer:
f(1)=-1+6-6= - 1
f(2)=-4+12-6 = - 2
f(3)= - 9+18-6 = 3
f(4)= - 16+24-6 = 4
f(5)= - 25 +30 - 6= -1
Step-by-step explanation:
Alex literally just put what's in between the brackets (1,2....) in the place of x
or you just look at the graph
Hope this helps, have a great day