Find two numbers whose difference is 5 and the product is the least possible.
Let the larger number of two numbers be x. Then the other number is `(x-5)`
The product of the two numbers is `y = x(x-5)` .
We should find x such that y is a minimum. To find that we can use differentiation....
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-4 & 1
The difference between them is 5 and from what I have worked out it is the pair of numbers with the smallest possible product.