If x=(3+√8) then find the value of x^2 +1/x^2 and x^4+1/x^4

1.	If x=(3+√8) then find the value of x^2 +1/x^2 and x^4+1/x^4
Answer» x^2 + 1/x^2 = 79x^4 + 1/x^4 = 6239.

Discussion