When finding f'(x)=0,
6x - 12 + 5x is actually 11x - 12. This root gives you x = 12/11.
The critical points are x = {0, 12/11, 2}.
Find the critical numbers of the function and describe the behavior of f at these numbers.
I took the derivative using product rule
Then i simplified and set
and the three points i got were
and
i know 0 is right, but 2 and 12 is wrong.
what am i doing wrong?