Among all pairs of numbers whose difference is 4, find a pair whose product is as small as possible. What is the minimum product? The pair of numbers whose difference is 4 and whose product is as small as possible is 4. (Use a comma to separate answers.) The minimum product is - 4

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Polynomials

Try substituting 1. You will get 6 and not 0. Try other real values also. What About -2? Let us check.