Question

Find the rationalising factor of 5 root 7

Please give right answer as soon as possible ​

Answer 1

$\sqrt{7}$

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Answer 2

Answer:

Therefore, lowest rationalizing factor is ( 7 + √7 ).

√5 × 2√5 = 2 × (√5)^2 = 3 × 5 = 15, which is rational. Therefore, each of the surds √5 and 2√5 is a rationalizing factor of the other.