Question

The simplest rationalizing factor of √20- √45 is​

Answer 1

Step-by-step explanation:

$\sqrt{20} - \sqrt{45} \\ = \sqrt{ {2}^{2} \times 5 } - \sqrt{ {3}^{2} \times 5 } \\ = 2 \sqrt{5} - 3 \sqrt{5} \\ = - 1 \sqrt{5} \\ rationalising \: factor \: is \: \sqrt{5}$