Answer:
critical point is 0
f is maximum because at the critical point we substitute x = 0 at the derivative
Step-by-step explanation:
the critical point is at the point x= 0 after taking the derivative, we equate it to zero and the result is 0.
f is maximum because at the critical point we substitute x = 0 at the derivative we have 5 > 0
the interval on the left of the critical point is - infinity < f< 0
on this interval increasing while f is negative
on the right of critiocal point 0 >= f < +infinity
on this interval f is increasing while f is positive.
