Solution
Given : $$x^2-3x+1=0$$
Dividing both sides by $$'x'$$
=> $$x+\frac{1}{x}=3$$
Squaring both sides, we get :
=> $$x^2+\frac{1}{x^2}+2(x)(\frac{1}{x})=9$$
=> $$x^2+\frac{1}{x^2}=9-2=7$$
=> Ans - (B)
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