Question

find the rationalising for the denominator of. expression 1 upon root 5 - 2

Answer 1

•1/root 5-2 = 1*root 5+2/root5-2*root5+2 •             =  root 5+2 /(root5 )square –(2) square               •               = root 5+2/5-4=root 5+2/1

Answer 2

    1
√5-√2
=    √5+√2
(√5-√2)(√5+√2)

=    √5+√2
    (√5)²-(√2)²

=    √5+√2
         5-2

=     √5+√2
           3

Hope it helps