alleryStart learning →For x > 0, what is the minimum value of x + 1/x?
A4
B2
C0
D1
Answer & Solution
Correct answer: B. 2
The derivative 1 - 1/x^2 vanishes at x = 1 where the second derivative 2/x^3 is positive, giving the minimum 1 + 1 = 2.
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