Question

The simplest rational factor 2/15 is
(a) 215/5
(b) 2V5/7
(c) 317
(d) none​

Answer 1

Given:

To find: Rationalisation factor of the given expression

Solution:  

Rationalisation factor is an irrational number that is multiplied with the given irrational expression to make it free from square roots.

Now, the rationalisation factor of  will be

∵ , which is rational (free from roots)

Similarly,

∴

⇒ , which is rational

Hence, rationalisation factor of    is  .