Evaluate $(57)^{2} - (43)^{2}$.

Evaluate $(57)^{2} - (43)^{2}$.
  1. $1400$
  2. $196$
  3. $1000$
  4. $2400$

Solution

$57^{2} - 43^{2} = (57-43)(57+43) = 14 \times 100 = 1400$.

Asked in: IMO

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