Question

if x=9-4√5 tjen find: x-1/x​

Answer 1

Answer:

follow me

Step-by-step explanation:

Answer 2

Answer:

given : x=9-4√5.

then. : x-1/x = ?

9-4√5 -1 / 9-4√5

9-4√5 -1 / 9-4√5 × 9+4√5 /9+4√5

(9-4√5 -1)(9+4√5)

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81 - 16×5

(9-4√5 -1)(9+4√5)

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81 - 85

(9-4√5 -1)(9+4√5)

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-4

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