How do I prove that that a function f must have a zero on a given interval [a,b]
thanks,
D.
You could explicitly try to find the zero, but that would be "messy" here. My guess is that you've seen the theorem I was referring to in my last post (a continuous function that changes sign in an interval, has a zero in that interval). Can you check that your function is indeed positive and negative on [0,3]?