What numbers multiply to 400 but add up to 40?

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20 + 20 = 40
20 x 20 = 400
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What are the numbers when you add you get -3 when multiplied you get 40?

There are no two real numbers that do. Using complex numbers, these two do: (- 3 / 2 + i √151 / 2 ) & (- 3 / 2 - i √151 / 2 ) . Two numbers that add to -3