If (x + 1/x) = 3, then (x2 + 1/x2) is equal to :
Option:
A. 10 / 3
B. 82 / 9
C. 7
D. 11
Answer: C . 7
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Justification:
x + 1/x = 3
→ (x + 1/x)2 = 9
→ x2 + 1/x2 + 2 = 9
→ x2 + 1/x2 = 7.
