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posted by robert on Monday, November 21, 2011 at 10:54pm.
f(x)=-8xlnx decreases over what domain
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
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