If x^n+\dfrac{1}{x^{2n}}=1 , find the value of the polynomial x^{5n}+x^n+2

Given x^2-3x+1=0 , find the value of the expression x^2+\dfrac{1}{x^2} , x^3+\dfrac{1}{x^3} and x^4+\dfrac{1}{x^4}