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How do I prove that x + 1/x is greater than or equal to 2 if x > 0

i'm not allowed to use calculus either.

i got that x + 1/x is greater than zero, but i can't get greater than or equal to 2.

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# Homework Help: How do I prove that x + 1/x is greater than or equal to 2 if x > 0

**Physics Forums | Science Articles, Homework Help, Discussion**