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GRE9367

Posted: Sun Jul 12, 2009 12:09 pm
by aas56
I have difficutlities to solve these kind of questions for example questionn 44 in GRE9367:
if x is real and P a polynomial function then lim (P(x+3h)-P(x-3h-2P(x))/h^2 as h--> 0 =
the right answer is 9P''(x)
how can we get it?

Re: GRE9367

Posted: Sun Jul 12, 2009 6:00 pm
by zombie
try L'Hopital's rule