Posted by robert on .
f(x)=8xlnx decreases over what domain

math 
Reiny,
f'(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