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Question

The value of (103)2 using identity is.
  1. 10609
  2. 10906
  3. 10606
  4. 10806


Solution

The correct option is A 10609
We know that,
(a+b)2=a2+b2+2ab

Now, 
103 can be written as (100+3).
On applying the identity (a+b)2 and 
considering, a = 100 and b = 3,

(103)2
=1002+32+2×100×3
=10609

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