SOLUTION: Find a number of the form 4xy(x + y)(x - y) which is divisible by 5, the quotient being a square.

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Question 985343: Find a number of the form 4xy(x + y)(x - y) which is divisible by 5, the quotient being a square.

Answer by ikleyn(52781) About Me  (Show Source):
You can put this solution on YOUR website!

x = 5, y = 4.

Check:  4*5*4(5+4)*(5-4) = 4*5*4*9*1.

            It is divisible by  5,  and the quotient is the square  4*4*9.