Find the coordinates of the turning point on the graph of and determine its
nature.
I used the product rule and got
so to find the coordinates of the turning point I set that first derivative equal to 0.
or
and to find the 'nature' of the turning points I have to take the second derivative. in which I dont get the correct answer, heres my working,
the derivative of
using the product rule on
=
but the my book says that the correct answer is