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2016-03-01T12:12:06+05:30

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Sq.root of 28
first find the prime factors for 28
sq.root of 28 = sq.root (2*2*7)
  so we get 2 - two times & 7 - one times
so the answer of 
   sq.root of 28 = 2 x sq.root of 7

some more examples
36 = 2*2*3*3
    sq.root of 36 = 2*3 =6
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