Domain is [-10,∞)
2 is included , only at x=2 new function begins
Range is the values of y , so range is [-7]∪[-4,6
I think, it should be like this.
It depends on how many options you have
You multiply the total number of books you have time 5 because you can choose 5
(x-9) (x+2)=x²+2x-9x-18=x²-7x-18
a(1) = 3(1)-1 = 3-1 = 2
a(2) = 3(2)-1 = 6-1 = 5
a(3) = 3(3)-1 = 9-1 = 8
So, the sequence would be 2,5,8,11....
