If x is equal to 9 + 4 under root 5 then find the value of x minus one

1.	If x is equal to 9 + 4 under root 5 then find the value of x minus one upon x
Answer» Step-by-step EXPLANATION: X=9+4√5 1/x=1/9+4√5 Rationalising 1/x=1(9-4√5)/(9+4√5)(9-4√5) =9-4√5/81-80 =9-4√5/1 1/x=9-4√5 now, x - 1/x= 9+4√5-(9-4√5) x - 1/x= 9+4√5-9+4√5 x - 1/x=8√5

If x is equal to 9 + 4 under root 5 then find the value of x minus one upon x

Answer»

Step-by-step EXPLANATION:

X=9+4√5

1/x=1/9+4√5

Rationalising

1/x=1(9-4√5)/(9+4√5)(9-4√5)

=9-4√5/81-80

=9-4√5/1

1/x=9-4√5

now,

x - 1/x= 9+4√5-(9-4√5)

x - 1/x= 9+4√5-9+4√5

x - 1/x=8√5

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If x is equal to 9 + 4 under root 5 then find the value of x minus one upon x

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