If x =
, then x2 +
-2 =
Given x= √6 + √5
X2 = 11 + 2√11
1/x2 = 11- 2√11
So, x2 + 1/x2 – 2 = 11+ 2√11 + 11 – 2√11 -2 = 22-2 = 20.
23
If x = , then x2 + -2 =
Given x= √6 + √5
X2 = 11 + 2√11
1/x2 = 11- 2√11
So, x2 + 1/x2 – 2 = 11+ 2√11 + 11 – 2√11 -2 = 22-2 = 20.