(1)x^2+1/x^2=(x+1/x)^2-2=9-2=7(2)(x-1/x)^2=x^2+1/x^2-2=7-2=5
(1)x^2+1/x^2=(x+1/x)²-2=3²-2=7 (2) (x-1/x)^2=(x+1/x)²-4=3²-4=5
(1)x^2+1/x^2=(x+1/x)^2-2=9-2=7(2) (x-1/x)^2=x^2+1/x^2-2=7-2=5