Question

lowest rationalising factor of √5-√2​

Answer 1

Answer:

21

Step-by-step explanation:

=$\sqrt{5}-\sqrt{2}$

= $(\sqrt{5} - \sqrt{2}) * (\sqrt{5}+\sqrt{2})$

=$\sqrt{5} * \sqrt{5} - \sqrt{2} * \sqrt{2}$                               [(a-b)*(a+b)=a^2-b^2]

=25-4

=21