you only need f'(x) to find turning points, f''(x) is only needed to find the nature of the turning points. for simple optimization questions you can usually work out whether the point is a maximum or a minimum without f''(x). also good luck for tomorrow :0
I thought we had to double differentiate when finding min max but your just doing it once then substitute the answer in???
Bro is sweating tommorrow.
@ 😭😭😭
you only need f'(x) to find turning points, f''(x) is only needed to find the nature of the turning points. for simple optimization questions you can usually work out whether the point is a maximum or a minimum without f''(x).
also good luck for tomorrow :0