If x = 9 -4√5 find,
(a) √x-1/√x
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0
x=9+4
5
=>
x
1
=
9+4
5
1
×
9−4
5
9−4
5
=>
x
1
=9−4
5
Let y=
x
−
x
1
Squaring both sides,
y
2
=x+
x
1
−2
=>y
2
=9+4
5
+9−4
5
−2
y=+4,−4
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