- #1
naspek
- 181
- 0
Let f(x) = 5x^3 +4x + 8
(i) find f'(x)
answer--> 15x^2 + 4
(ii) Show that f(x) is increasing on ([tex]-\infty,\infty[/tex])
answer--> don't know how to prove it..
(iii)Hence find the minimum and maximum value of f(x) on the closed
interval [1,3]
answer-->please guide me to start aswering this question..
(i) find f'(x)
answer--> 15x^2 + 4
(ii) Show that f(x) is increasing on ([tex]-\infty,\infty[/tex])
answer--> don't know how to prove it..
(iii)Hence find the minimum and maximum value of f(x) on the closed
interval [1,3]
answer-->please guide me to start aswering this question..