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 Share with your friends Share 11 Abhinav Verma answered this 1) 7 + 2root3 -4 View Full Answer Krishnan Unni answered this 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. 1