Undergraduate

Show that the point of inflection of f ( x ) = x ( x 2 4 ) 2 lies midway between the relative extrema

Show that the point of inflection of
f(x)= x(x 24)2
lies midway between the relative extrema of f.
Begin by finding the first derivative.
f=
Next, find the second derivative.
f=
Then, find the relative extrema.
smaller x-value
(x, y)
=
larger x-value
(x, y)
=
Finally, find the inflection point.
(x, y)=
This confirms that the inflection point is midway between the relative extrema of f.

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