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Assuming we are looking for two numbers here:
1. x * y = -160
2. x + y = 36
Rewriting 2. gives
3. y = -x + 36
Substituting 3. into 1 gives:
x * (-x + 36) = -160
-x2 + 36x = -160
-x2 + 36x + 160 = 0
(x + 4) (-x + 40) = 0
x + 4 = 0
x = -4
and
-x + 40 = 0
x = 40
Therefore the two numbers are -4 & 40.
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