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What is the product of b and the sum of a number x and 3?

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What two numbers have a sum of 3 and a product of 4?

    x+y=3   xy=4   so   x(3-x)=3   3x-x^2-3=0   so   x^2-3x+3=0     We can't factor this, so we use the quadratic equation     3+ or -