To what pages must Narding open his book so that the product of the book's two facing pages is 5700? 17292?

The pages are consecutive so 

n(n+1)=5700 
n^2+n-5700=0
(n-76)(n+75) 

page 75 
The second problem is the same (has the same procedure for solution)
n(n+1)=17292 
leads to page 131 

:)