Question

x=3+√8 find the value of x4+1/x4

Answer 1

x= 3+2=5
20+1/20=41/20

Answer 2

We will use simple rationalization and an identity to solve the given question.

Identity used:
(a + 1/a)^2 = a^2 + 1/a^2 + 2

Refer to the attachment.