Posted by chelsea on Wednesday, March 23, 2011 at 1:49pm.
use the product rule to calculate
q'(x)=4x3e^(-x)+x4*(-e^(-x)
= (4-x)x^3*e^(-x)
Since e^(-x)>0 on ℝ, this means
that q'(x) has zeroes at x=0 and x=4 only.
q'(5)=-125e^(-5)<0
which demonstrates that q(x) is strictly monotonically decreasing on [4,∞) and therefore...
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