If x^2 + 1/x^2 = 23, find the positive value of x + 1/x.
A3
B4
C5
D6
Explanation
(x + 1/x)^2 = x^2 + 1/x^2 + 2 = 23 + 2 = 25 => x + 1/x = sqrt(25) = 5.
Exam Relevance
- Topic: Algebra
- Subtopic: Algebraic Identities
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