How do you find the inflection points of the graph of the function: #f(x) = ((4 x)/e^(9 x))#?
Inflection points are points on the graph at which the concavity changes. So investigate concavity.
To investigate concavity, we will look at the sign of the second derivative.
# = (4-36x)/e^(9x)#
# = (36(9x-2))/e^(9x)#
the inflection point is: