Re: ISI 2015 PEA Answer Key - Discuss

Posted by soumen08 on Apr 13, 2015; 12:12am
URL: http://discussion-forum.276.s1.nabble.com/ISI-2015-PEA-Answer-Key-Discuss-tp7596123p7596147.html

Also, what you seem to have done for question 14 is f(2) - f(1)

By the stationary point theorem (some lemma I forget), We can say that at some point, f'(x) = (f(2) - f(1) )/1 . This is also fairly intuitive.

Consider our function as being 100*x^2 + 100*x + 1
So that, a = 100, b = 100

Note our function is defined on [1,2] as required by the question.

Now, your answer says that k = 3a+b = 400 which isnt between 1 and 2 as required by the question.

Actually, the whole question is wrong. The answer options should have been f'(k) = 3a+b etc. In that case, option c would be right.

What do you think?