356
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1 x 356, 2 x 178, 4 x 89 = 356
If x is one of the numbers then the other is (89-x). Both these are positive, so x>0 and 89-x>0 or x<89. Then P(x) = x*(89-x) = 89x-x2 where 0<x<89
Discriminant = 52 - 4 x 2 x (-8) = 89
89 x 20 = 1780 89 x 5 = 445 80 x 20 = 1600 9 x 20 = 180 80 x 5 = 400 9 x 5 = 45
89