If 2[x^2+1/x^2]-2[x-1/x]-8=0 then what two values of x-1/x?

RRB Junior Engineer Stage 1 Model Papers 10

Question : 19 of 98

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2[x^2+1/x^2]-2[x-1/x]-8=0

then what two values of

x-1/x

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