Re: ISI INTERVIEW PREP

Posted by neha on Jun 29, 2012; 5:59pm
URL: http://discussion-forum.276.s1.nabble.com/ISI-INTERVIEW-PREP-tp7578819p7578820.html

I think it should be done like this:

let f(x) =e^x-x-2

f'(x)=e^x -1
f"(x)=e^x,, putting f'(x)=0 gives x=0  and f"(0) =1 which means at x=0 the function has a local minima,, The point of local minima is (0,-1).Since this point lies below the origin,, it must cut the x axis which means f(x) =0 for two real values of x