Question

Root a +root b what could the rationalisation factor

Answer 1

√a + √ b multiple √ a - √ b / √ a - √ b
a - b / √a - √ b

Answer 2

$( \sqrt{a} + \sqrt{b} )( \sqrt{a} - \sqrt{b} ) \\ = {( \sqrt{a} )}^{2} - {( \sqrt{b} )}^{2} \\ = a - b$
$\therefore \: the \: rationalisng \: factor \: is \: ( \sqrt{a} - \sqrt{b} )$
Hope it'll help...:)