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Let f (x) = 2x + LNX & nbsp;, then & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; () A. X = 12 is the maximum of F (x), B. x = 12 is the minimum of F (x), C. x = 2 is the maximum of & nbsp; f (x), D. x = 2 is the minimum of & nbsp; f (x)
∵ f (x) = 2x + LNX; ∵ f ′ (x) = - 2x2 + 1x = x − 2x2; X ＞ 2 {f ′ (x) ＞ 0; 0 ＜ x ＜ 2} f ′ (x) ＜ 0. X = 2 is the minimum point of F (x)
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