CPM Homework Help : CALC Problem 11-14

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11-14.

Multiple Choice: If $a > 0$ , $f(x) = x + ax^{−2}$ will have a relative minimum at:

Hint:

$f^\prime(x)=1-2ax^{-3}=0$

$x = \sqrt { 2 a }$

$x = \sqrt [ 3 ] { 2 a }$

$x = a$

$x = \sqrt { 2 }$

$x = ± 2a$

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