Question

rationalise 4/root5 -1​

Answer 1

=4/√5-1

=(4)(√5+1)/(√5-1)(√5+1)

=4√5+4/(√5)^2-(1)^2

=4√5+4/5-1

=4√5+4/4

=4√5/4+4/4

=√5+1:-answer