James spent $(2y2 + 6). he bought notebooks that each cost $(y2 − 1). the expression to find the number of notebooks james bought is . if y = 3, james bought notebooks. nextreset

The first thing you should do is to divide the total cost by the unit cost you have got: (2y^2 + 6) / (y^2 - 1) 
Then just use simple math by plugging in the value y=3
(2*3²+6): (3²-1)=  24:8 = 3 which is the nubmer of the bought notebooks. 

In total he spent $24 on notebooks that cost $8.