Question

Rationalise the denominator of 1 / √7 -2

Answer 1

Step-by-step explanation:

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Answer 2

Step-by-step explanation:

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We use the identity (a+ √b)(a-√b) =a^2-b^2

Multiply and divide 1/√7-2 by √7+2 to get

1. --------->1/√7-2
2. -------->√7+2/√7+2
3. -------->√7 +2/7-4
4. ---------> = √7+2/3

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