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91Ó°ÊÓ

It is false that limx→∞1000x=∞. Express this fact in a mathematical sentence involving MandN, to show how the formal definition of limit fails in this case.

Short Answer

Expert verified

There is some M>0for which there is no N>0that would guarantee that if x>Nthen1000x>M.

Step by step solution

01

Step 1. Given information.

The given function islimx→∞1000x=∞.

02

Step 2. Explanation.

From the given expression, we have, c=∞,L=∞.

The limit expression can be written as a formal statement as below,

For all M>0there is some N>0such that if,

role="math" localid="1649076328357" x∈N,∞then1000x∈M,∞.

So, the smallest value of Nis given by:

1000x=Mx=1000M

Hence, there is some M>0for which there is no N>0that would guarantee that ifx>Nthen1000x>M.

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