Question

X=9-4√5. Value of :√x+1÷√x and x²-1÷x²

Answer 1

[root X +1/root X] the whole square = X +1/X+2 [due to [a+b]the whole square]
By rationalisation
X+1/X + 2= 9-4 root5 +9+4root5+2
=16
So rootX+1/rootX =root 16 =4
By using this same method you can find X Square -1/X square