book Maths Puzzle Numerical Ability

Please Help me with this equation:(4n-8m)(4n+8m)

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book Other Question

The length of a rectangular swimming pool is 2x-1 meters, and the width is x +2 meters. Write a polynomial that represents the area. Find the area if x is 5 meters. A pay phone is holding a maximum number of 500 coins consisting of nickels, dimes and quarters. The number of quartes is twice the number of dimes.
If the value of all the coines is $88.00, how many nickles were in the pay phone?