Posted by Anonymous on Friday, March 5, 2010 at 9:29pm.
a) 45 = 15 x 3 = (9+6)(9-6) = 81 - 36
= 9^2 - 6^2
b) 77 = 11 x 7 = (9 + 2) (9 - 2)
= 9^2 - 2^2
c) Your turn
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