http://sdrv.ms/19P0FGN
http://sdrv.ms/19P0Gun
In regards to:
So the solutions manual says:
I'm wondering is that a typo? Is it not supposed to be:
Thank You...
If one reviews the second solution method -- the "guess and check" -- one notes that the displayed differentiation does not result in the desired form. I agree with your noted change of sign.
So the solutions manual says:
I'm wondering is that a typo?