Formula is (a^2+b^2)/ab+1let a and b be positive integers such that (ab+1) divides (a^2+b^2). show that (a^2+b^2)/(ab+1) is the square of an integer.

The john nash mall used 17,4000 kilowatt hours in may, with a peak load of 92 kilowatts. the demand charge is $5.95 per kilowatt, and the energy charge is $0.08 per kilowatt hour. the fuel adjustment charge is $0.017 per kilowatt hour. what is the total electricity cost for may?