Question

what is the least rationalising gator of 4√5​

Answer 1

Answer:

$\sqrt{5}$

Step-by-step explanation:

The least rationalising factor of an irrational number is the smallest positive number which should be multiplied to it such that the product is rational.

Here, 4$\sqrt{5}$*$\sqrt{5}$=20(rational number). Also, $\sqrt{5}$ is the smallest positive number that satisfies the condition that the product should be rational.

Therefore the answer will be $\sqrt{5}$.