Question 291299
x(x+1)=2162 [short cut - find the square root of the integer then add & subtract approximately 0.5 for the 2 answers.] 
x^2+x-2162=0
(x-46)(x+47)=0
x-46=0
x=46 the number of the left hand page.
46+1=47 the number of the right hand page. 
Proof:
46*47=2162
2162=2162