If x – 1/x = 4, find the value of x^2 + 1/x^2.

Topic: Algebra
Subtopic: Algebraic Identities

A14

B16

C18

D20

Explanation

Squaring both sides: (x – 1/x)^2 = 4^2 => x^2 + 1/x^2 – 2 = 16 => x^2 + 1/x^2 = 18.

Exam Relevance

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