Correct Answer: Option B
x^2-3x+1=0
বা, x^2-3x=-1
বা, x(x-3)=-1
বা, x-3=-1/x
বা, x+1/x=3
বা, (x+1/x)^2=3^2
বা, (x+1/x)^2=9
বা, (x-1/x)^2+4.x.1/x=9
বা, (x-1/x)^2=9-4
বা, (x-1/x)^2=5
বা, x-1/x=√5 এখন, x^2-1/x^2=(x+1/x) (x-1/x)
=3√5
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