It is positive because -80+89 = 9
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236 + 89 = 325
78 + 89 + 167 + 897 + 78 = 1309
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
Many different numbers added together can equal 89. Some examples are 88+1, 45+44 and 60+29
89 x 20 = 1780 89 x 5 = 445 80 x 20 = 1600 9 x 20 = 180 80 x 5 = 400 9 x 5 = 45