Question

The number  obtained  on  rationalizing the denominator  of  1 / root7 - 2  is

(root7+2)/3

(root7-2)/3

(root7+2)/5

(root7+2)/45​

Answer 1

Answer:

A is tes correct answer

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Step-by-step explanation:

We use the identity (a+b)(a−b)=a2−b.

Multiply and divide 7−21 by 7+2 to get 

7−21×7+27+2=7−47+2=37+2