Re: DSE 2012- Question 16,29 and 30.

Posted by mrittik on Jun 19, 2014; 8:16am
URL: http://discussion-forum.276.s1.nabble.com/DSE-2012-Question-16-29-and-30-tp7580148p7593067.html

q16. f(x)=x^7-x-1=0....so its value when x=0, f(x)=-1, f(x)=-1, x=1...f(x)=126;x=2...so from change in 1 to 2 it changes its sign. Next f'(x)=7x^6-1>0 when x=1....so it has only 1 root in b/w (0,2).