If x + 1/x = 5, what is the value of x^2 + 1/x^2?

Topic: Algebra
Subtopic: Identities

A21

B23

C25

D27

Explanation

Squaring both sides: (x + 1/x)^2 = 5^2 => x^2 + 2 + 1/x^2 = 25 => x^2 + 1/x^2 = 23.

Exam Relevance

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