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Question

Using a suitable identity, evaluate the following:

(69.3)2(30.7)2


  1. 3860
  2. 38.6
  3. 38600
  4. 386


Solution

The correct option is A 3860
We know,  (a+b)(ab)=a2b2.
So,
(69.3)2(30.7)2=(69.3+30.7)(69.330.7)                             =100×38.6                             =3860

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