Deciding zero's to a polynomial function

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Brian
Brian on 14 Jun 2013
Hi, the question I have to answer is the following: "Decide all the zeros to the function : 0.1x^3 - 5x^2 –x +e^-x = -4, x>0"
I want to know how I can represent this function in matlab? I can't seem to input exp/e. Thanks.
Any help on finding the roots would also be appreciated. Thanks in advance!

Answers (1)

Roger Stafford
Roger Stafford on 14 Jun 2013
Use 'fzero' and replace e^-x with exp(-x).
  2 Comments
Brian
Brian on 14 Jun 2013
I'm confused about what to enter, I had this but I'm clearly doing something wrong.
y=[0.1*x.^3 +5*x.^2 -1*x exp(-x)]
fzero(y)
thanks
Brian
Brian on 15 Jun 2013
I still can't get fzero to work :/ thanks for your help so far

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