0
Anonymous
(x-1)*(x+1) = x2 - x + x - 1 = x2 - 1
So, when x = 30,
29*31 = 30*30 - 1
Or, since 30*30 = 900, 29*31 = 900-1 = 899
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899
72,000
37 does not divide evenly into 900 The answer is 900/37 = 24.324
30 x 30 = 900
15 times 60=900