Question

Given the function defined by f(x) = x^5-5x^4+3, find all values of x for which the graph f is concave up:
a) x> 0
b) x >3
c) 0 < x < 3
d) x < 0 and x > 3
e) x < 0 or x >5

Answer 1

do u even second derivative...
show your prior work please :)

Answer 2

this was the question. when i did the first derivative i got f'(x) = 5x^4-20x^3, the second derive was f''(x) = 20x^3 -60x^2