Question

If a + 1/ a = 2 , find a^8=1 / a^4

Answer 1

Answer:

−a1=8

Squaring both sides,

=(a−a1)2=82

=a2+(a1)2−2(a)(a1)=64

=a2+a21−2=64

=a2+a21=66

Now,

(a+a1)2=a2+a21+2(a)(a1)

                         =66+2

                         =68

=>a+a1=68

                    =±217

Now,

a2−