Show that the function f(x)=2$\displaystyle x^3$+3$\displaystyle x^2$+17 is not 1-1 on the interval [-1,1].

Printable View

- Apr 24th 2010, 07:29 PMtn11631show that the function is not 1-1
Show that the function f(x)=2$\displaystyle x^3$+3$\displaystyle x^2$+17 is not 1-1 on the interval [-1,1].

- Apr 24th 2010, 07:34 PMmaddas
It has a minimum at x=0...

- Apr 24th 2010, 07:50 PMalice8675309
- Apr 24th 2010, 08:03 PMmaddas
Yes, same idea, that one still has an extremum in the interior of [-1,1] (at x=0).

edit: wait, who asked this question?? - Apr 24th 2010, 08:04 PMtn11631
- Apr 24th 2010, 08:10 PMmaddas
...bro, be honest with me. Do you have split personalities or something? Are they all working on different questions?

- Apr 25th 2010, 02:02 AMtn11631