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Natasha2012 [34]
3 years ago
7

Help me pls help ..........

Mathematics
1 answer:
harkovskaia [24]3 years ago
7 0

Answer:

4

Step-by-step explanation:

(x)^2+(1/x)^2=18

(x-1/x)^2+2x.1/x=18

(x-1/x)^2+2=18

(x-1/x)^2=16

(x-1/x)^2=4^2

x-1/x=4

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