Compute $98^{2}$ using $(a-b)^{2}$.

Compute $98^{2}$ using $(a-b)^{2}$.
  1. $9604$
  2. $9404$
  3. $9804$
  4. $9614$

Solution

$98^{2} = (100 - 2)^{2} = 10000 - 400 + 4 = 9604$.

Asked in: IMO

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