Write the lowest rationalising factor of √5 - 3.

Sum

(√5 - 3)(√5 + 3) = (√5)² - (3)² = 5 - 9 = -4

∴ lowest rationalizing factor is (√5 + 3)

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Rationalisation of Surds

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Chapter 1: Rational and Irrational Numbers - Exercise 1 (C) [Page 21]

Chapter 1 Rational and Irrational Numbers
Exercise 1 (C) | Q 2.3 | Page 21

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