Q. 235.0( 5 Votes )

If x = , then x2 + -2 =
A. 2

B. 2

C. 24

D. 20

Answer :

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.

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