Question

Apply the identities to calculate 201 is to power 2− 197 is to power 2

Answer 1

39991

203×197=(200+3)×(200−3)

Applying the formula (a+b)(a−b)=a

2

−b

2

, where a=200,b=3

203×197=(200+3)×(200−3)=200

2

−3

2

=40,000−9=39991