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2014-07-28T10:25:07+05:30

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Evaluate the square of 198 Do it like this. 198^2= (200-2)^2 = 200^2 -2x200x2 + 2^2 = 40000 -800 +4 = 32004 { by using ( a-b)^2 = a^2 -2ab - b^2
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2014-07-28T17:21:15+05:30
If you want to find the square of 198, i.e., (198)², then it would go like this:
(198)²
(200-2)²                             (Because 200-2=198)
(a-b)²=a²+b²-2ab
Here, a is 200 and b is 2(not -2)
Then,
[(200)²+(2)²-(2*200*2)]
(40000+4-800)
40004-800
39,204
      <-------Answer.


Check:
198*198=39,204

Thus, the answer is 39,204.

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