Question

rationalise 2/√7-2 plz tall me ​

Answer 1

We need to multiply the numerator and denominator of 1/(√7 - 2) by √7 + 2, to get 1/(√7 - 2) x (√7 + 2)/(√7 + 2) = (√7 + 2)/(√7 - 2)(√7 + 2) We need to apply the formula (a - b)(a + b) = a2 - b2 in the denominator to get 1/(√7 - 2) = (√7 + 2)/(√7)2 - (2)2 = (√7 + 2)/(7 -4) = (√7 + 2)/3Read more on Sarthaks.com - https://www.sarthaks.com/111609/rationalize-the-denominators-of-the-following-1-7-2

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