Re: DSE 2013

Posted by Granpa Simpson on Apr 14, 2014; 7:33am
URL: http://discussion-forum.276.s1.nabble.com/DSE-2013-tp7586799p7586857.html

for question number 24 the answer will be (1/26)...the solution can be obtained by linear approximation of the function around the point x=1 or -1...now if we approximate the function around x=1 we get
f(x)= 8+26*(x-1),
f inv = (x-18)/26.
f'inv = 1/26.
Similarly for x=-1,
f(x)=8-26*(x+1)
f inv= (x+18)/26.
f' inv= (1/26)......
so the answer is 1/26