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xy = -40 (1)
x + y = 16 (2)
y = 16 -x
substitute into (1)
x (16-x) = -40
16x - x^2 + 40 = 0
x^2 -16x -40 = 0
x = (16 +/- SQRT(256+160))/2
x = 18.2 or -2.2 which are the the two numbers you are looking for
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