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January 28, 2015

January 28, 2015

Posted by **robert** on Monday, November 21, 2011 at 10:54pm.

- math -
**Reiny**, Tuesday, November 22, 2011 at 9:46amf'(x) = -8x(1/x ) + (-8)lnx

= -8 - lnx

to be decreasing, -8 - 8lnx < 0

8lnx + 8 > 0

8 lnx > -8

lnx > -1

(solve lnx = -1, x = 1/e

which is true for all x > 1/e

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