Question

if x^3=√2+1 Find value of (x-1/x) + 3(x+1/x)

Answer 1

x=1-√2 1/x=1/1-√2      =1/1-√2 * 1+√2/1+√2      =1+√2/12- √22      =1+√2/-1      =√2-1 X+I/X=1-√2+√2-1        =0 (X+1/X)3 =0