The rationalising factor of 7 - 2 root 3 is

1. 7 + 2 root 3

2. 7 - 2 root 3

3. 4 + 2 root 3

4. 5 + 2 root 3

1) 7 + 2root3

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The  correct  rationalizing  factor  for  7 - 2  root  3  is  7  +  2  root  3.  This  is  because,  in  general,  rationalizing  factor  for  a - b  is  always  a + b.

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