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If x is one of the numbers then the other is (89-x).

Both these are positive, so x>0 and 89-x>0 or x<89.

Then P(x) = x*(89-x) = 89x-x2 where 0<x<89

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Q: The sum of two positive numbers is 89 Find a function that models their product P in terms of x one of the numbers?
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