Plz help me machanla maths help ekak ona

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[66000V]

(x-1/x)^2 salakapan ,
=x^2+(1/x^2)-2x/x
=18-2
=16

ema nisa (x-1/x)=+4 or -4

ans E

 

[Rovin]

bmp

 

[vinky]

you are correct.
rep+, onna nil kala

thanks ShreddeR