Question

Evaluate (997^2-3^2)

Answer 1

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$\large{(997^2-3^2)}$

Applying a^2-b^2=(a+b) (a-b)

$\large{(997+3)(997-3)}$

$\large{(1000)(994)}$

$\huge{9,94,000}$

Answer 2

Using a^2 - b ^2=(a-b)(a+b identity

We can simplfy the que as

(997+3)(997-3) =1000*994=994000