Question

1 if x+1/x=2 then x^2012+1/x^2012=........
2 if A > B > C > D, find the digits A,B,C,D which are from 1 to 9 so that ABCD-DCBA=BDAC
3 solve x+y=28 xy=127

Answer 1

1) is that x + (1/x) or (x+1)/x?

2)
7641 - 1467 = 6174

3)
(x,-y) = (14±√69)

Answer 2

it is x+(1/x)