Question

Rationalizing factor of root 5 - root 7

Answer 1

Answer:

(√5-√7)(√5+√7)

5-7

-2

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Answer 2

Let x = √7 - √5

Now, (√7 - √5)(√7 + √5)² =

(√7)² – (√5)² = 7 - 5 = 2 (rational number)

So, (√7 + √5) is a rationalising factor.